From 00c75f34a8b493f1d1514b4d8dc588c06ab23829 Mon Sep 17 00:00:00 2001
From: epoberezkin <epoberezkin@users.noreply.github.com>
Date: Thu, 2 Apr 2026 20:14:51 +0000
Subject: [PATCH] deploy: d44dba630c833b7451ad12d7c942fb1c7f3afc07

---
 about/index.html                              |   4 +-
 ar/contact/index.html                         |   4 +-
 ar/fdroid/index.html                          |   4 +-
 ar/file/index.html                            | 913 ------------------
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 ...er-experience-safety-in-public-groups.html |   4 +-
 ...ension-for-securely-connecting-people.html |   4 +-
 ...-contacts-protect-groups-app-security.html |   4 +-
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 cs/contact/index.html                         |   4 +-
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 cs/file/index.html                            | 913 ------------------
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 cs/invitation/index.html                      |   4 +-
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 cs/old/index.html                             |   4 +-
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 css/tailwind.css                              |  20 -
 de/contact/index.html                         |   4 +-
 de/fdroid/index.html                          |   4 +-
 de/file/index.html                            | 913 ------------------
 de/index.html                                 |   4 +-
 de/invitation/index.html                      |   4 +-
 de/messaging/index.html                       |   4 +-
 de/old/index.html                             |   4 +-
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 directory/index.html                          |   4 +-
 docs/android.html                             |   4 +-
 docs/business.html                            |   4 +-
 docs/cli.html                                 |   4 +-
 docs/code_of_conduct.html                     |   4 +-
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 docs/directory.html                           |   4 +-
 docs/glossary.html                            |   4 +-
 docs/guide/app-settings.html                  |   4 +-
 docs/guide/audio-video-calls.html             |   4 +-
 docs/guide/chat-profiles.html                 |   4 +-
 docs/guide/making-connections.html            |   4 +-
 docs/guide/managing-data.html                 |   4 +-
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 docs/lang/cs/android.html                     |   4 +-
 docs/lang/cs/cli.html                         |   4 +-
 docs/lang/cs/contributing.html                |   4 +-
 docs/lang/cs/server.html                      |   4 +-
 docs/lang/cs/simplex.html                     |   4 +-
 docs/lang/cs/translations.html                |   4 +-
 docs/lang/cs/webrtc.html                      |   4 +-
 docs/lang/fr/android.html                     |   4 +-
 docs/lang/fr/cli.html                         |   4 +-
 docs/lang/fr/contributing.html                |   4 +-
 docs/lang/fr/server.html                      |   4 +-
 docs/lang/fr/simplex.html                     |   4 +-
 docs/lang/fr/translations.html                |   4 +-
 docs/lang/fr/webrtc.html                      |   4 +-
 docs/lang/pl/android.html                     |   4 +-
 docs/lang/pl/cli.html                         |   4 +-
 docs/lang/pl/contributing.html                |   4 +-
 docs/lang/pl/server.html                      |   4 +-
 docs/lang/pl/simplex.html                     |   4 +-
 docs/lang/pl/translations.html                |   4 +-
 docs/lang/pl/webrtc.html                      |   4 +-
 docs/protocol/simplex-chat.html               |   4 +-
 docs/server.html                              |   4 +-
 docs/simplex.html                             |   4 +-
 docs/themes.html                              |   4 +-
 docs/trademark.html                           |   4 +-
 docs/translations.html                        |   4 +-
 docs/webrtc.html                              |   4 +-
 docs/why.html                                 |   4 +-
 docs/xftp-server.html                         |   4 +-
 donate/index.html                             |   4 +-
 downloads/index.html                          |   4 +-
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 en/index.html                                 |   4 +-
 en/invitation/index.html                      |   4 +-
 en/messaging/index.html                       |   4 +-
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 faq/index.html                                |   4 +-
 fdroid/index.html                             |   4 +-
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 fi/index.html                                 |   4 +-
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 fi/old/index.html                             |   4 +-
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 file/index.html                               | 913 ------------------
 fr/contact/index.html                         |   4 +-
 fr/fdroid/index.html                          |   4 +-
 fr/file/index.html                            | 913 ------------------
 fr/index.html                                 |   4 +-
 fr/invitation/index.html                      |   4 +-
 fr/messaging/index.html                       |   4 +-
 fr/old/index.html                             |   4 +-
 fr/why/index.html                             |   4 +-
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 he/index.html                                 |   4 +-
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 hu/index.html                                 |   4 +-
 hu/invitation/index.html                      |   4 +-
 hu/messaging/index.html                       |   4 +-
 hu/old/index.html                             |   4 +-
 hu/why/index.html                             |   4 +-
 id/contact/index.html                         |   4 +-
 id/fdroid/index.html                          |   4 +-
 id/file/index.html                            | 913 ------------------
 id/index.html                                 |   4 +-
 id/invitation/index.html                      |   4 +-
 id/messaging/index.html                       |   4 +-
 id/old/index.html                             |   4 +-
 id/why/index.html                             |   4 +-
 index.html                                    |   4 +-
 invitation/index.html                         |   4 +-
 it/contact/index.html                         |   4 +-
 it/fdroid/index.html                          |   4 +-
 it/file/index.html                            | 913 ------------------
 it/index.html                                 |   4 +-
 it/invitation/index.html                      |   4 +-
 it/messaging/index.html                       |   4 +-
 it/old/index.html                             |   4 +-
 it/why/index.html                             |   4 +-
 ja/contact/index.html                         |   4 +-
 ja/fdroid/index.html                          |   4 +-
 ja/file/index.html                            | 913 ------------------
 ja/index.html                                 |   4 +-
 ja/invitation/index.html                      |   4 +-
 ja/messaging/index.html                       |   4 +-
 ja/old/index.html                             |   4 +-
 ja/why/index.html                             |   4 +-
 jobs/index.html                               |   4 +-
 messaging/index.html                          |   4 +-
 nl/contact/index.html                         |   4 +-
 nl/fdroid/index.html                          |   4 +-
 nl/file/index.html                            | 913 ------------------
 nl/index.html                                 |   4 +-
 nl/invitation/index.html                      |   4 +-
 nl/messaging/index.html                       |   4 +-
 nl/old/index.html                             |   4 +-
 nl/why/index.html                             |   4 +-
 old/index.html                                |   4 +-
 pl/contact/index.html                         |   4 +-
 pl/fdroid/index.html                          |   4 +-
 pl/file/index.html                            | 913 ------------------
 pl/index.html                                 |   4 +-
 pl/invitation/index.html                      |   4 +-
 pl/messaging/index.html                       |   4 +-
 pl/old/index.html                             |   4 +-
 pl/why/index.html                             |   4 +-
 privacy/index.html                            |   4 +-
 pt_BR/contact/index.html                      |   4 +-
 pt_BR/fdroid/index.html                       |   4 +-
 pt_BR/file/index.html                         | 913 ------------------
 pt_BR/index.html                              |   4 +-
 pt_BR/invitation/index.html                   |   4 +-
 pt_BR/messaging/index.html                    |   4 +-
 pt_BR/old/index.html                          |   4 +-
 pt_BR/why/index.html                          |   4 +-
 reproduce/index.html                          |   4 +-
 ro/contact/index.html                         |   4 +-
 ro/fdroid/index.html                          |   4 +-
 ro/file/index.html                            | 909 -----------------
 ro/index.html                                 |   4 +-
 ro/invitation/index.html                      |   4 +-
 ro/messaging/index.html                       |   4 +-
 ro/old/index.html                             |   4 +-
 ro/why/index.html                             |   4 +-
 ru/contact/index.html                         |   4 +-
 ru/fdroid/index.html                          |   4 +-
 ru/file/index.html                            | 913 ------------------
 ru/index.html                                 |   4 +-
 ru/invitation/index.html                      |   4 +-
 ru/messaging/index.html                       |   4 +-
 ru/old/index.html                             |   4 +-
 ru/why/index.html                             |   4 +-
 security/index.html                           |   4 +-
 tr/contact/index.html                         |   4 +-
 tr/fdroid/index.html                          |   4 +-
 tr/file/index.html                            | 909 -----------------
 tr/index.html                                 |   4 +-
 tr/invitation/index.html                      |   4 +-
 tr/messaging/index.html                       |   4 +-
 tr/old/index.html                             |   4 +-
 tr/why/index.html                             |   4 +-
 transparency/index.html                       |   4 +-
 uk/contact/index.html                         |   4 +-
 uk/fdroid/index.html                          |   4 +-
 uk/file/index.html                            | 913 ------------------
 uk/index.html                                 |   4 +-
 uk/invitation/index.html                      |   4 +-
 uk/messaging/index.html                       |   4 +-
 uk/old/index.html                             |   4 +-
 uk/why/index.html                             |   4 +-
 vouchers/index.html                           |   4 +-
 why/index.html                                |   4 +-
 zh_Hans/contact/index.html                    |   4 +-
 zh_Hans/fdroid/index.html                     |   4 +-
 zh_Hans/file/index.html                       | 913 ------------------
 zh_Hans/index.html                            |   4 +-
 zh_Hans/invitation/index.html                 |   4 +-
 zh_Hans/messaging/index.html                  |   4 +-
 zh_Hans/old/index.html                        |   4 +-
 zh_Hans/why/index.html                        |   4 +-
 zh_Hant/contact/index.html                    |   4 +-
 zh_Hant/fdroid/index.html                     |   4 +-
 zh_Hant/file/index.html                       | 909 -----------------
 zh_Hant/index.html                            |   4 +-
 zh_Hant/invitation/index.html                 |   4 +-
 zh_Hant/messaging/index.html                  |   4 +-
 zh_Hant/old/index.html                        |   4 +-
 zh_Hant/why/index.html                        |   4 +-
 298 files changed, 546 insertions(+), 22458 deletions(-)
 delete mode 100644 ar/file/index.html
 delete mode 100644 bg/file/index.html
 delete mode 100644 cs/file/index.html
 delete mode 100644 de/file/index.html
 delete mode 100644 en/file/index.html
 delete mode 100644 es/file/index.html
 delete mode 100644 fa/file/index.html
 delete mode 100644 fi/file/index.html
 delete mode 100644 file/index.html
 delete mode 100644 fr/file/index.html
 delete mode 100644 he/file/index.html
 delete mode 100644 hu/file/index.html
 delete mode 100644 id/file/index.html
 delete mode 100644 it/file/index.html
 delete mode 100644 ja/file/index.html
 delete mode 100644 nl/file/index.html
 delete mode 100644 pl/file/index.html
 delete mode 100644 pt_BR/file/index.html
 delete mode 100644 ro/file/index.html
 delete mode 100644 ru/file/index.html
 delete mode 100644 tr/file/index.html
 delete mode 100644 uk/file/index.html
 delete mode 100644 zh_Hans/file/index.html
 delete mode 100644 zh_Hant/file/index.html

diff --git a/about/index.html b/about/index.html
index abe1a48c83..0cd2bfbc27 100644
--- a/about/index.html
+++ b/about/index.html
@@ -126,7 +126,7 @@
                 </a>
             </li>
 
-            <hr>
+            <!-- <hr>
 
             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -134,7 +134,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/ar/contact/index.html b/ar/contact/index.html
index 937cbc7992..562416afe9 100644
--- a/ar/contact/index.html
+++ b/ar/contact/index.html
@@ -136,7 +136,7 @@
                 </a>
             </li>
 
-            <hr>
+            <!-- <hr>
 
             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -144,7 +144,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/ar/fdroid/index.html b/ar/fdroid/index.html
index 4b11fc0e2c..b513390ddd 100644
--- a/ar/fdroid/index.html
+++ b/ar/fdroid/index.html
@@ -136,7 +136,7 @@
                 </a>
             </li>
 
-            <hr>
+            <!-- <hr>
 
             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -144,7 +144,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/ar/file/index.html b/ar/file/index.html
deleted file mode 100644
index 1422bd61c1..0000000000
--- a/ar/file/index.html
+++ /dev/null
@@ -1,913 +0,0 @@
-<!DOCTYPE html>
-<html lang="ar"
-    
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-    <head>
-        <meta charset="UTF-8">
-        <script>if (localStorage.getItem('theme') === 'dark' || (!localStorage.getItem('theme') && window.matchMedia('(prefers-color-scheme: dark)').matches)) document.documentElement.classList.add('dark')</script>
-
-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
-        <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        <title>SimpleX File Transfer</title>
-        <meta name="description" content="Send files securely with end-to-end encryption"/>
-        <meta name="Content-Type" content="text/html;charset=utf-8"/>
-        
-        <meta http-equiv="onion-location" content="http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/" />
-        <meta property="og:url" content="https://simplex.chat/" />
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-        <meta property="og:type" content="website"/>
-        <meta property="og:title" content="SimpleX File Transfer"/>
-        <meta property="og:description" content="Send files securely with end-to-end encryption"/>
-        <meta property="og:image" content="https://simplex.chat/img/share_simplex.jpg"/>
-        <meta name="twitter:card" content="summary"/>
-        <link rel="icon" type="image/png" sizes="96x96" href="/img/favicon.ico"/>
-        <meta name="theme-color" content="#F3FAFF">
-
-        <link rel="stylesheet" href="/css/swiper-bundle.min.css">
-        <link rel="stylesheet" href="/css/blog.css">
-        <link href="/css/tailwind.css" rel="stylesheet"/>
-        <link rel="stylesheet" href="/css/style.css">
-        <link rel="stylesheet" href="/css/design3-nav.css">
-        <script async defer src="https://buttons.github.io/buttons.js"></script>
-        <script src="/js/flag-anchor.js"></script>
-        
-    </head>
-    <body class="bg-[#F3FAFF] dark:bg-[#000832]">
-        
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-<header id="navbar">
-    <a href="/ar" class="logo logo-light ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-light.png" alt="logo"></a>
-    <a href="/ar" class="logo logo-dark ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-dark.png" alt="logo"></a>
-
-    <nav id="menu">
-        <ul>
-            <li class="nav-link ">
-                <a href="/ar">
-                    <span class="nav-link-text">الشاشة الرئيسية</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link ">
-                <a href="/directory/">
-                    <span class="nav-link-text">دليل</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link send-file active">
-                <a href="/file/">
-                    <span class="nav-link-text">إرسال ملف</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link">
-                <a href="javascript:void(0);">
-                    <span class="">الدليل</span>
-                    <span href="" id="btn-mobile">
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-                </a>
-
-                <ul class="sub-menu">
-                    
-                        <li><a href="/docs/guide/readme.html" class="">بداية سريعة</a></li>
-                    
-                        <li><a href="/docs/guide/send-messages.html" class="">إرسال الرسائل</a></li>
-                    
-                        <li><a href="/docs/guide/secret-groups.html" class="">مجموعات سرية</a></li>
-                    
-                        <li><a href="/docs/guide/chat-profiles.html" class="">ملفات تعريف الدردشة</a></li>
-                    
-                        <li><a href="/docs/guide/managing-data.html" class="">إدارة البيانات</a></li>
-                    
-                        <li><a href="/docs/guide/audio-video-calls.html" class="">مكالمات الصوت والفيديو</a></li>
-                    
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-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
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-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
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-  /* Scroll fade: gradient over text area only, hidden at bottom */
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-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
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-    background: linear-gradient(rgba(7,28,70,0), #071C46);
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-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
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-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
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-    to { opacity: 1; transform: scale(1) translateY(0); }
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-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
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-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
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-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/ar/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -140,7 +140,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/bg/fdroid/index.html b/bg/fdroid/index.html
index 6533ecb2bb..56f36dcf25 100644
--- a/bg/fdroid/index.html
+++ b/bg/fdroid/index.html
@@ -132,7 +132,7 @@
                 </a>
             </li>
 
-            <hr>
+            <!-- <hr>
 
             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -140,7 +140,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/bg/file/index.html b/bg/file/index.html
deleted file mode 100644
index a3a8237483..0000000000
--- a/bg/file/index.html
+++ /dev/null
@@ -1,909 +0,0 @@
-<!DOCTYPE html>
-<html lang="bg"
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-    <head>
-        <meta charset="UTF-8">
-        <script>if (localStorage.getItem('theme') === 'dark' || (!localStorage.getItem('theme') && window.matchMedia('(prefers-color-scheme: dark)').matches)) document.documentElement.classList.add('dark')</script>
-
-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
-        <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        <title>SimpleX File Transfer</title>
-        <meta name="description" content="Send files securely with end-to-end encryption"/>
-        <meta name="Content-Type" content="text/html;charset=utf-8"/>
-        
-        <meta http-equiv="onion-location" content="http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/" />
-        <meta property="og:url" content="https://simplex.chat/" />
-        
-        <meta property="og:type" content="website"/>
-        <meta property="og:title" content="SimpleX File Transfer"/>
-        <meta property="og:description" content="Send files securely with end-to-end encryption"/>
-        <meta property="og:image" content="https://simplex.chat/img/share_simplex.jpg"/>
-        <meta name="twitter:card" content="summary"/>
-        <link rel="icon" type="image/png" sizes="96x96" href="/img/favicon.ico"/>
-        <meta name="theme-color" content="#F3FAFF">
-
-        <link rel="stylesheet" href="/css/swiper-bundle.min.css">
-        <link rel="stylesheet" href="/css/blog.css">
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-        <link rel="stylesheet" href="/css/style.css">
-        <link rel="stylesheet" href="/css/design3-nav.css">
-        <script async defer src="https://buttons.github.io/buttons.js"></script>
-        <script src="/js/flag-anchor.js"></script>
-        
-    </head>
-    <body class="bg-[#F3FAFF] dark:bg-[#000832]">
-        
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-<header id="navbar">
-    <a href="/bg" class="logo logo-light ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-light.png" alt="logo"></a>
-    <a href="/bg" class="logo logo-dark ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-dark.png" alt="logo"></a>
-
-    <nav id="menu">
-        <ul>
-            <li class="nav-link ">
-                <a href="/bg">
-                    <span class="nav-link-text">Дом</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link ">
-                <a href="/directory/">
-                    <span class="nav-link-text">Directory</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link send-file active">
-                <a href="/file/">
-                    <span class="nav-link-text">Send file</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link">
-                <a href="javascript:void(0);">
-                    <span class="">Guide</span>
-                    <span href="" id="btn-mobile">
-                        <svg viewBox="0 0 10 6" xmlns="http://www.w3.org/2000/svg">
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-                        <li><a href="/docs/guide/readme.html" class="">Quick start</a></li>
-                    
-                        <li><a href="/docs/guide/send-messages.html" class="">Sending messages</a></li>
-                    
-                        <li><a href="/docs/guide/secret-groups.html" class="">Secret groups</a></li>
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-                    
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-                        <li><a href="/docs/guide/app-settings.html" class="">App settings</a></li>
-                    
-                        <li><a href="/docs/guide/making-connections.html" class="">Making connections</a></li>
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-
-            <hr>
-
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-                    <span class="">Справка</span>
-                    <span href="" id="btn-mobile">
-                        <svg viewBox="0 0 10 6" xmlns="http://www.w3.org/2000/svg">
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-
-                <ul class="sub-menu">
-                    <li><a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/overview-tjr.md"
-                        target="_blank">Whitepaper
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-                        target="_blank">СМП Протокол
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-
-                    <hr>
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-                        <li><a href="/docs/directory.html" class=" lg:px-[20px] inline-block whitespace-nowrap">SimpleX Directory</a></li>
-                    
-                        <li><a href="/docs/android.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Accessing Android files</a></li>
-                    
-                        <li><a href="/docs/server.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Host SMP Server</a></li>
-                    
-                        <li><a href="/docs/xftp-server.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Host XFTP Server</a></li>
-                    
-                        <li><a href="/docs/webrtc.html" class=" lg:px-[20px] inline-block whitespace-nowrap">WebRTC servers</a></li>
-                    
-                        <li><a href="/downloads/" class=" lg:px-[20px] inline-block whitespace-nowrap">Downloads</a></li>
-                    
-                        <li><a href="/reproduce/" class=" lg:px-[20px] inline-block whitespace-nowrap">Verify & reproduce builds</a></li>
-                    
-                        <li><a href="/transparency/" class=" lg:px-[20px] inline-block whitespace-nowrap">Transparency</a></li>
-                    
-                        <li><a href="/security/" class=" lg:px-[20px] inline-block whitespace-nowrap">Security</a></li>
-                    
-                        <li><a href="/faq/" class=" lg:px-[20px] inline-block whitespace-nowrap">FAQ</a></li>
-                    
-
-                    <hr>
-
-                    <li><a href="/docs/translations.html"
-                    >Translate SimpleX Chat
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Accessing Android files
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Пример за чат бот
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-                    <li><a href="/docs/cli.html">Системна конзола</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
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-
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-            <li class="nav-link ">
-                <a href="/blog">
-                    <span class="nav-link-text">Блог</span>
-                </a>
-            </li>
-        </ul>
-    </nav>
-
-    <div class="right-links">
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-            <a class="box-btn token md:hidden" href="/donate">
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-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-        iconToggle();
-    }
-    updateThemeColor();
-}
-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
-        }
-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
-        }
-    }
-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/bg/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-    <button id="hamburger" class="nav-toggle-btn">
-        <svg viewBox="0 0 100 80" width="36" height="36">
-            <rect width="100" height="15"></rect>
-            <rect y="30" width="100" height="15"></rect>
-            <rect y="60" width="100" height="15"></rect>
-        </svg>
-    </button>
-</div>
-
-
-<script>
-// switch theme
-const sunIcon = document.querySelector('.sun');
-const moonIcon = document.querySelector('.moon');
-
-const userTheme = localStorage.getItem('theme');
-const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
-const prismThemeLink = document.getElementById('prism-theme')
-
-function iconToggle () {
-    sunIcon.classList.toggle('hidden');
-    moonIcon.classList.toggle('hidden');
-}
-
-function updateThemeColor() {
-    const meta = document.querySelector('meta[name="theme-color"]');
-    if (meta) meta.setAttribute('content', getComputedStyle(document.body).backgroundColor);
-    const navbar = document.querySelector('header#navbar');
-    if (navbar && navbar.classList.contains('open')) {
-        navbar.style.transition = 'none';
-        navbar.classList.remove('open');
-        setTimeout(() => {
-            navbar.classList.add('open');
-            setTimeout(() => navbar.style.transition = '', 0);
-        }, 0);
-    }
-}
-
-function themeCheck() {
-    if (userTheme === 'dark' || (!userTheme && systemTheme)) {
-        document.documentElement.classList.add('dark');
-        moonIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-    }
-    else{
-        sunIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-    }
-    updateThemeColor();
-}
-themeCheck();
-
-function themeSwitch () {
-    if (document.documentElement.classList.contains('dark')) {
-        document.documentElement.classList.remove('dark');
-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-        iconToggle();
-    } else {
-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-        iconToggle();
-    }
-    updateThemeColor();
-}
-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
-        }
-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
-        }
-    }
-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        Pro přenos souborů je zapotřebí JavaScript.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX Přenos Souborů</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Přetáhněte soubor sem</p>
-          <p class="hint">nebo</p>
-          <span class="btn">Vyberte soubor</span>
-          <p class="hint">Max 100 MB - <a href="#join-simplex">SimpleX Chat apka</a> podporuje soubory až do 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX Přenos Souborů</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Stahování</button>
-          <div class="security-note">
-            <p>Tento soubor je šifrován - datové směrovače nikdy neuvidí obsah souboru, jméno nebo velikost.</p>
-            <p>Šifrovací klíč je obsažen v hash části odkazu – nikdy se neodesílá na žádný server.</p>
-            <p>Pro větší bezpečnost, použijte <a href="https://simplex.chat/download">SimpleX Chat</a> apku.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Odeslání souborů bezpečně s šifrováním end-to-end — žádné účty, žádné sledování.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Další informace o protokolu XFTP</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Získejte SimpleX Chat — nejbezpečnější &amp; soukromí komunikátor
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      Přenos souborů, který jste právě použili, používá stejný protokol pro přenos dat jako SimpleX Chat. Aplikace má end-to-end šifrované zprávy, hlasové a video volání, skupiny a odesílání souborů. Žádný účet. Žádný telefon. Žádný e-mail. Žádné ID uživatelského profilu.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/cs/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protokol: nejbezpečnější přenos souborů</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">Není nutný žádný účet</h3>
-  <p>Každá část souborů používá nový náhodný klíč. Datové směrovače nemají "uživatele" nebo "soubory" - přenášejí šifrované části souborů stejných velikostí.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Trojitě zašifrováno ve vašem prohlížeči</h3>
-  <p>Šifrovací klíč souboru je obsažen pouze v části hash adresy URL – váš prohlížeč jej nikdy neodesílá na server. Existují 3 úrovně šifrování: přenos přes protokol TLS, šifrování pro každého příjemce (jedinečný dočasný klíč pro každý přenos) a šifrování souborů typu end-to-end.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Nezávislé směrovače dat</h3>
-  <p>Když je soubor rozdělen na části, je odeslán přes síťové směrovače provozované nezávislými stranami. Žádný operátor nemůže vidět aktuální velikost nebo jméno souboru. I kdyby byl směrovač ohrožen, může vidět pouze šifrované části s pevně stanovenou velikosti. Části souboru jsou v mezipaměti síťových směrovačů uchovávány přibližně 48 hodin.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Přečtěte si specifikaci XFTP protokolu →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX Přenos Souborů",
-    "dropZone": "Přetáhněte soubor sem",
-    "dropZoneHint": "nebo",
-    "chooseFile": "Vyberte soubor",
-    "maxSizeHint": "Max 100 MB - <a href=\"#join-simplex\">SimpleX Chat apka</a> podporuje soubory až do 1 GB",
-    "encrypting": "Šifruji…",
-    "uploading": "Nahrávám…",
-    "cancel": "Zrušit",
-    "fileUploaded": "Nahrané soubory",
-    "copy": "Kopírovat",
-    "copied": "Zkopírováno!",
-    "share": "Sdílet",
-    "expiryHint": "Soubory jsou obvykle k dispozici 48 hodin.",
-    "securityNote1": "Váš soubor byl zašifrován v prohlížeči - datové routery nikdy neuvidí obsah souboru, jméno nebo velikost.",
-    "securityNote2": "Šifrovací klíč je obsažen v hash části odkazu – nikdy se neodesílá na žádný server.",
-    "securityNote3": "Pro větší bezpečnost, použijte <a href=\"https://simplex.chat/download\">SimpleX Chat</a> apku.",
-    "retry": "Znovu",
-    "downloading": "Stahuji…",
-    "decrypting": "Dešifruji…",
-    "downloadComplete": "Stažení dokončeno",
-    "download": "Stahování",
-    "fileTooLarge": "Soubor příliš velký (%size%). Maximum je 100 MB. <a href=\"#join-simplex\">SimpleX app</a> podporuje soubory až do 1 GB.",
-    "fileEmpty": "Soubor je prázdný.",
-    "invalidLink": "Neplatný nebo poškozený odkaz.",
-    "initError": "Chyba inicializace: %error%",
-    "fileAvailable": "Dostupný soubor (~%size%)",
-    "dlSecurityNote1": "Tento soubor je šifrován - datové směrovače nikdy neuvidí obsah souboru, jméno nebo velikost.",
-    "dlSecurityNote2": "Šifrovací klíč je obsažen v hash části odkazu – nikdy se neodesílá na žádný server.",
-    "dlSecurityNote3": "Pro větší bezpečnost, použijte <a href=\"https://simplex.chat/download\">SimpleX Chat</a> apku.",
-    "workersRequired": "Vyžadováni Web Workers — aktualizujte prohlížeč"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
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-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-                        <li><a href="/docs/business.html" class=" lg:px-[20px] inline-block whitespace-nowrap">SimpleX für geschäftliche Anwendungen</a></li>
-                    
-                        <li><a href="/docs/directory.html" class=" lg:px-[20px] inline-block whitespace-nowrap">SimpleX-Verzeichnis</a></li>
-                    
-                        <li><a href="/docs/android.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Zugriff auf Android-Dateien</a></li>
-                    
-                        <li><a href="/docs/server.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Eigenen SMP-Server hosten</a></li>
-                    
-                        <li><a href="/docs/xftp-server.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Eigenen XFTP-Server hosten</a></li>
-                    
-                        <li><a href="/docs/webrtc.html" class=" lg:px-[20px] inline-block whitespace-nowrap">WebRTC-Server</a></li>
-                    
-                        <li><a href="/downloads/" class=" lg:px-[20px] inline-block whitespace-nowrap">Downloads</a></li>
-                    
-                        <li><a href="/reproduce/" class=" lg:px-[20px] inline-block whitespace-nowrap">Builds überprüfen und reproduzieren</a></li>
-                    
-                        <li><a href="/transparency/" class=" lg:px-[20px] inline-block whitespace-nowrap">Transparenzberichte</a></li>
-                    
-                        <li><a href="/security/" class=" lg:px-[20px] inline-block whitespace-nowrap">Sicherheitskonzept</a></li>
-                    
-                        <li><a href="/faq/" class=" lg:px-[20px] inline-block whitespace-nowrap">FAQ</a></li>
-                    
-
-                    <hr>
-
-                    <li><a href="/docs/translations.html"
-                    >SimpleX Chat übersetzen
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Zugriff auf Android-Dateien
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Beispiel für einen Chatbot
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">Terminal-Kommandozeilen-Schnittstelle</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                </ul>
-            </li>
-
-            <hr>
-
-            <li class="nav-link ">
-                <a href="/blog">
-                    <span class="nav-link-text">Blog</span>
-                </a>
-            </li>
-        </ul>
-    </nav>
-
-    <div class="right-links">
-        
-            <a class="box-btn token md:hidden" href="/donate">
-                Spenden
-            </a>
-        
-        <button href="#" class="theme-switch-btn">
-            <svg class="sun" width="469" height="469" viewBox="0 0 469 469" fill="none" xmlns="http://www.w3.org/2000/svg">
-            <path d="M225.768 1.44594C220.301 3.84594 214.701 10.6459 213.768 15.9793C213.234 18.3793 213.101 31.7126 213.368 45.7126L213.768 71.1793L217.634 76.1126C226.701 88.1126 242.968 87.5793 252.301 75.0459C254.968 71.5793 255.101 69.5793 255.101 42.2459C255.101 14.9126 254.968 12.9126 252.301 9.44594C250.834 7.44594 248.034 4.51261 246.168 3.17928C241.768 -0.154057 231.101 -1.08739 225.768 1.44594Z"/>
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-            </svg>
-
-            <svg class="moon" width="469" height="469" viewBox="5 5 20 23" xmlns="http://www.w3.org/2000/svg">
-                <path d="M10.895 7.574c0 7.55 5.179 13.67 11.567 13.67 1.588 0 3.101-0.38 4.479-1.063-1.695 4.46-5.996 7.636-11.051 7.636-6.533 0-11.83-5.297-11.83-11.83 0-4.82 2.888-8.959 7.023-10.803-0.116 0.778-0.188 1.573-0.188 2.39z"></path>
-            </svg>
-        </button>
-
-        
-
-        <button id="cross-btn" class="nav-toggle-btn">
-            <svg id="cross" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-            <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z" />
-        </svg>
-        </button>
-    </div>
-</header>
-<div id="mobile-header">
-    <a href="/de" class="logo flex dark:hidden ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-light.svg" alt="" srcset=""></a>
-    <a href="/de" class="logo hidden dark:flex ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-dark.svg" alt="" srcset=""></a>
-
-    <button id="hamburger" class="nav-toggle-btn">
-        <svg viewBox="0 0 100 80" width="36" height="36">
-            <rect width="100" height="15"></rect>
-            <rect y="30" width="100" height="15"></rect>
-            <rect y="60" width="100" height="15"></rect>
-        </svg>
-    </button>
-</div>
-
-
-<script>
-// switch theme
-const sunIcon = document.querySelector('.sun');
-const moonIcon = document.querySelector('.moon');
-
-const userTheme = localStorage.getItem('theme');
-const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
-const prismThemeLink = document.getElementById('prism-theme')
-
-function iconToggle () {
-    sunIcon.classList.toggle('hidden');
-    moonIcon.classList.toggle('hidden');
-}
-
-function updateThemeColor() {
-    const meta = document.querySelector('meta[name="theme-color"]');
-    if (meta) meta.setAttribute('content', getComputedStyle(document.body).backgroundColor);
-    const navbar = document.querySelector('header#navbar');
-    if (navbar && navbar.classList.contains('open')) {
-        navbar.style.transition = 'none';
-        navbar.classList.remove('open');
-        setTimeout(() => {
-            navbar.classList.add('open');
-            setTimeout(() => navbar.style.transition = '', 0);
-        }, 0);
-    }
-}
-
-function themeCheck() {
-    if (userTheme === 'dark' || (!userTheme && systemTheme)) {
-        document.documentElement.classList.add('dark');
-        moonIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-    }
-    else{
-        sunIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-    }
-    updateThemeColor();
-}
-themeCheck();
-
-function themeSwitch () {
-    if (document.documentElement.classList.contains('dark')) {
-        document.documentElement.classList.remove('dark');
-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-        iconToggle();
-    } else {
-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-        iconToggle();
-    }
-    updateThemeColor();
-}
-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
-        }
-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
-        }
-    }
-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        Für den Datei-Transfer wird JavaScript benötigt.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX Dateiübertragung</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Datei per Drag &amp; Drop hinzufügen</p>
-          <p class="hint">oder</p>
-          <span class="btn">Datei auswählen</span>
-          <p class="hint">Max. 100 MB — die <a href="#join-simplex">SimpleX Chat App</a> unterstützt Dateien bis zu 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX Dateiübertragung</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Herunterladen</button>
-          <div class="security-note">
-            <p>Diese Datei ist verschlüsselt — Datenrouter sehen weder Inhalt, Namen noch Größe der Datei.</p>
-            <p>Der für die Verschlüsselung genutzte Schlüssel befindet sich im Hash‑Fragment des Links und wird niemals an einen Server übertragen.</p>
-            <p>Für noch mehr Sicherheit verwenden Sie die <a href="https://simplex.chat/download">SimpleX Chat App</a>.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Versenden Sie Dateien via Ende-zu-Ende-Verschlüsselung — ohne Benutzerkennungen, ohne Tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Erfahren Sie mehr über das XFTP-Protokoll</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Laden Sie sich die SimpleX Chat App herunter — die sicherste &amp; private Messenger-App
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      Die Dateiübertragung, die Sie gerade verwendet haben, nutzt dasselbe Datenweiterleitungsprotokoll wie SimpleX Chat. Die App bietet Ende‑zu‑Ende‑verschlüsselte Nachrichten, Sprach‑ und Videoanrufe, Gruppen sowie das Senden von Dateien. Keine Benutzerkennung. Kein Telefon. Keine E‑Mail. Keine Benutzerprofil‑IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/de/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP-Protokoll: Der sicherste Dateitransfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">Es wird keine Benutzerkennung benötigt</h3>
-  <p>Jedes Dateifragment verwendet einen neuen zufälligen Schlüssel. Datenrouter kennen keine "Benutzer" oder "Dateien" — sie übertragen nur verschlüsselte Dateifragmente fester Größe.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Dreifach direkt in Ihrem Browser verschlüsselt</h3>
-  <p>Der für die Dateiverschlüsselung genutzte Schlüssel befindet sich ausschließlich im Hash‑Fragment der URL — Ihr Browser sendet ihn niemals an einen Server. Es gibt drei Verschlüsselungsebenen: TLS‑Transport, empfängerbezogene Verschlüsselung (ein eindeutiger, flüchtiger Schlüssel pro Transfer) und Ende‑zu‑Ende‑Verschlüsselung der Datei.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Unabhängig voneinander arbeitende Datenrouter</h3>
-  <p>Wenn die Datei in Fragmente aufgeteilt wurde, wird sie über Netzwerkrouter übertragen, die von unabhängigen Parteien betrieben werden. Kein Betreiber kann die tatsächliche Dateigröße oder den Dateinamen sehen. Selbst wenn ein Router kompromittiert wird, sieht er nur verschlüsselte Fragmente fester Größe. Die Fragmente werden von den Netzwerkroutern für etwa 48 Stunden zwischengespeichert.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Lesen Sie die XFTP‑Protokollspezifikation durch →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
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-        </div>
-    </div>
-
-
-
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-  window.__XFTP_I18N__ = {
-    "title": "SimpleX Dateiübertragung",
-    "dropZone": "Datei per Drag & Drop hinzufügen",
-    "dropZoneHint": "oder",
-    "chooseFile": "Datei auswählen",
-    "maxSizeHint": "Max. 100 MB &mdash; die <a href=\"#join-simplex\">SimpleX Chat App</a> unterstützt Dateien bis zu 1 GB",
-    "encrypting": "Wird verschlüsselt…",
-    "uploading": "Wird hochgeladen…",
-    "cancel": "Abbrechen",
-    "fileUploaded": "Datei wurde hochgeladen",
-    "copy": "Kopieren",
-    "copied": "Wurde kopiert!",
-    "share": "Teilen",
-    "expiryHint": "Dateien sind in der Regel 48 Stunden lang verfügbar.",
-    "securityNote1": "Ihre Datei wurde im Browser verschlüsselt &mdash; Datenrouter sehen weder Inhalt, Namen noch Größe der Datei.",
-    "securityNote2": "Der für die Verschlüsselung genutzte Schlüssel befindet sich im Hash‑Fragment des Links und wird niemals an einen Server übertragen.",
-    "securityNote3": "Für noch mehr Sicherheit verwenden Sie die <a href=\"https://simplex.chat/download\">SimpleX Chat App</a>.",
-    "retry": "Wiederholen",
-    "downloading": "Wird heruntergeladen…",
-    "decrypting": "Wird entschlüsselt…",
-    "downloadComplete": "Herunterladen abgeschlossen",
-    "download": "Herunterladen",
-    "fileTooLarge": "Datei ist zu groß (%size%). Das Maximum ist 100MB. Die <a href=\"#join-simplex\">SimpleX Chat App</a> unterstützt Dateigrößen bis zu 1GB.",
-    "fileEmpty": "Datei ist leer.",
-    "invalidLink": "Ungültiger oder beschädigter Link.",
-    "initError": "Initialisierung fehlgeschlagen: %error%",
-    "fileAvailable": "Datei verfügbar (~%size%)",
-    "dlSecurityNote1": "Diese Datei ist verschlüsselt &mdash; Datenrouter sehen weder Inhalt, Namen noch Größe der Datei.",
-    "dlSecurityNote2": "Der für die Verschlüsselung genutzte Schlüssel befindet sich im Hash‑Fragment des Links und wird niemals an einen Server übertragen.",
-    "dlSecurityNote3": "Für noch mehr Sicherheit verwenden Sie die <a href=\"https://simplex.chat/download\">SimpleX Chat App</a>.",
-    "workersRequired": "Web Workers werden benötigt &mdash; aktualisieren Sie Ihren Browser"
-  }
-</script>
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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diff --git a/docs/cli.html b/docs/cli.html
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diff --git a/docs/lang/pl/android.html b/docs/lang/pl/android.html
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diff --git a/docs/lang/pl/translations.html b/docs/lang/pl/translations.html
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-
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-        <title>SimpleX File Transfer</title>
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-                <a href="/file/">
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-</header>
-<div id="mobile-header">
-    <a href="/" class="logo flex dark:hidden ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-light.svg" alt="" srcset=""></a>
-    <a href="/" class="logo hidden dark:flex ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-dark.svg" alt="" srcset=""></a>
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-// switch theme
-const sunIcon = document.querySelector('.sun');
-const moonIcon = document.querySelector('.moon');
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-const prismThemeLink = document.getElementById('prism-theme')
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-    sunIcon.classList.toggle('hidden');
-    moonIcon.classList.toggle('hidden');
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-function updateThemeColor() {
-    const meta = document.querySelector('meta[name="theme-color"]');
-    if (meta) meta.setAttribute('content', getComputedStyle(document.body).backgroundColor);
-    const navbar = document.querySelector('header#navbar');
-    if (navbar && navbar.classList.contains('open')) {
-        navbar.style.transition = 'none';
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-        document.documentElement.classList.add('dark');
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-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-    }
-    else{
-        sunIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-    }
-    updateThemeColor();
-}
-themeCheck();
-
-function themeSwitch () {
-    if (document.documentElement.classList.contains('dark')) {
-        document.documentElement.classList.remove('dark');
-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
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-        iconToggle();
-    } else {
-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-        iconToggle();
-    }
-    updateThemeColor();
-}
-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
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-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
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-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
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-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Acceso a archivos de Android
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Ejemplo de bot de Chat
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">Terminal CLI</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-const moonIcon = document.querySelector('.moon');
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-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        Se requiere JavaScript para transferir archivos.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">Transferencia de archivos SimpleX</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Arrastra y suelta el archivo aquí</p>
-          <p class="hint">o</p>
-          <span class="btn">Seleccionar archivo</span>
-          <p class="hint">Max 100 MB - <a href="#join-simplex">La app SimpleX Chat</a> soporta archivos hasta 1GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>Transferencia de archivos SimpleX</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Descargar</button>
-          <div class="security-note">
-            <p>El archivo está cifrado, los routers de datos no ven el contenido, el nombre o el tamaño.</p>
-            <p>La clave de cifrado está en el fragmento hash del enlace, nunca se envía a ningún servidor.</p>
-            <p>Para mejor seguridad, usa la app <a href="https://simplex.chat/download">SimpleX Chat</a>.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Envía archivos cifrados de extremo a extremo de forma segura - sin cuentas, sin ser monitorizado.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Descubre más sobre el protocolo XFTP</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Descarga SimpleX Chat — el mensajero privado &amp; más seguro
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      La transferencia de archivos que acabas de usar emplea el mismo protocolo de enrutamiento de datos que SimpleX Chat. La aplicación ofrece mensajería, llamadas de voz y video, grupos y envío de archivos con cifrado de extremo a extremo. Sin cuentas. Sin teléfono. Sin correo electrónico. Sin identificadores de usuario.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/es/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
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-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">Protocolo XFTP, la transferencia de archivos más segura</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
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-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No se necesita cuenta</h3>
-  <p>Cada fragmento del archivo usa una clave aleatoria. Los routers de datos no tienen "usuarios" o "archivos", solo transportan los fragmentos cifrados con un tamaño fijo.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple cifrado en tu navegador</h3>
-  <p>La clave de cifrado está presente solo en el fragmento hash de la URL, tu navegador nunca lo envía a un servidor. Hay tres capas de cifrado: transporte TLS, clave por transferencia (clave única y temporal por cada transferencia), y cifrado de extremo a extremo del archivo.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Routers de datos independientes</h3>
-  <p>Cuando un archivo se divide en fragmentos, se envía a través de routers en la red gestionados por terceros independientes. Ningún operador puede ver el nombre o el tamaño real del archivo. Incluso si un enrutador se ve comprometido, solo puede ver fragmentos cifrados de tamaño fijo. Los fragmentos de los archivos se almacenan por los routers de la red durante aproximadamente 48 horas.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Sobre las especificaciones del protocolo XFTP →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
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-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
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-            </div>
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-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
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-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "Transferencia de archivos SimpleX",
-    "dropZone": "Arrastra y suelta el archivo aquí",
-    "dropZoneHint": "o",
-    "chooseFile": "Seleccionar archivo",
-    "maxSizeHint": "Max 100 MB - <a href=\"#join-simplex\">La app SimpleX Chat</a> soporta archivos hasta 1GB",
-    "encrypting": "Cifrando…",
-    "uploading": "Subiendo…",
-    "cancel": "Cancelar",
-    "fileUploaded": "Archivo subido",
-    "copy": "Copiar",
-    "copied": "¡Copiado!",
-    "share": "Compartir",
-    "expiryHint": "Normalmente los archivos están disponibles durante 48 horas.",
-    "securityNote1": "Tu archivo se ha cifrado en el navegador, los routers de datos nunca ven el contenido, el nombre o el tamaño.",
-    "securityNote2": "La clave de cifrado está en el fragmento hash del enlace, nunca se envía a ningún servidor.",
-    "securityNote3": "Para mejor seguridad, usa la app <a href=\"https://simplex.chat/download\">SimpleX Chat</a>.",
-    "retry": "Reintentar",
-    "downloading": "Descargando…",
-    "decrypting": "Descifrando…",
-    "downloadComplete": "Descarga completada",
-    "download": "Descargar",
-    "fileTooLarge": "Archivo demasiado grande (%size%). Máximo 100MB. La <a href=\"#join-simplex\">app SimpleX</a> soporta archivos de hasta 1GB.",
-    "fileEmpty": "El archivo está vacío.",
-    "invalidLink": "Enlace corrupto o no válido.",
-    "initError": "Fallo al inicializar: %error%",
-    "fileAvailable": "Archivo disponible (~%size%)",
-    "dlSecurityNote1": "El archivo está cifrado, los routers de datos no ven el contenido, el nombre o el tamaño.",
-    "dlSecurityNote2": "La clave de cifrado está en el fragmento hash del enlace, nunca se envía a ningún servidor.",
-    "dlSecurityNote3": "Para mejor seguridad, usa la app <a href=\"https://simplex.chat/download\">SimpleX Chat</a>.",
-    "workersRequired": "Web Workers requerido, actualiza el navegador"
-  }
-</script>
-
-<script>
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-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-                            Protocolo SimpleX Chat
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-                            Terminal CLI
-                            <svg class="float-right" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-                            SimpleX bots API
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-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/fa/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
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-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/fi/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
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-                
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-    "copied": "Copied!",
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-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
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-    "invalidLink": "Invalid or corrupted link.",
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-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
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-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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diff --git a/fi/index.html b/fi/index.html
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-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">Terminal CLI</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
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-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
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-
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-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
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-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
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-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
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-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
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-      font-size: 22px;
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-  /* .flex is the full-width scroll container */
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-    flex: 1;
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-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
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-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
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-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
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-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
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-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
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-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
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-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
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-                    </div>
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-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
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-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
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-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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diff --git a/fr/contact/index.html b/fr/contact/index.html
index b679e1aa8b..f40e8119ec 100644
--- a/fr/contact/index.html
+++ b/fr/contact/index.html
@@ -136,7 +136,7 @@
                 </a>
             </li>
 
-            <hr>
+            <!-- <hr>
 
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@@ -144,7 +144,7 @@
                 </a>
             </li>
 
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+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/fr/fdroid/index.html b/fr/fdroid/index.html
index e083b9119d..b45fd00732 100644
--- a/fr/fdroid/index.html
+++ b/fr/fdroid/index.html
@@ -136,7 +136,7 @@
                 </a>
             </li>
 
-            <hr>
+            <!-- <hr>
 
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@@ -144,7 +144,7 @@
                 </a>
             </li>
 
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             <li class="nav-link">
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diff --git a/fr/file/index.html b/fr/file/index.html
deleted file mode 100644
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--- a/fr/file/index.html
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-<!DOCTYPE html>
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-        <ul>
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-            <li class="nav-link send-file active">
-                <a href="/file/">
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-                        <li><a href="/docs/webrtc.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Serveurs WebRTC</a></li>
-                    
-                        <li><a href="/downloads/" class=" lg:px-[20px] inline-block whitespace-nowrap">Téléchargements</a></li>
-                    
-                        <li><a href="/reproduce/" class=" lg:px-[20px] inline-block whitespace-nowrap">Verify & reproduce builds</a></li>
-                    
-                        <li><a href="/transparency/" class=" lg:px-[20px] inline-block whitespace-nowrap">Transparence</a></li>
-                    
-                        <li><a href="/security/" class=" lg:px-[20px] inline-block whitespace-nowrap">Sécurité</a></li>
-                    
-                        <li><a href="/faq/" class=" lg:px-[20px] inline-block whitespace-nowrap">FAQ</a></li>
-                    
-
-                    <hr>
-
-                    <li><a href="/docs/translations.html"
-                    >Traduire SimpleX Chat
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Accéder aux fichiers Android
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Exemple de chatbot
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">Terminal CLI</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                </ul>
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-</header>
-<div id="mobile-header">
-    <a href="/fr" class="logo flex dark:hidden ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-light.svg" alt="" srcset=""></a>
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-<script>
-// switch theme
-const sunIcon = document.querySelector('.sun');
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-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
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-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
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-  #app .success { color: #0053D0; }
-
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-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
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-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
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-
-  #app .stage > .btn { margin-top: 20px; }
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-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
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-    position: relative;
-    overflow: hidden;
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-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
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-    overflow-y: auto;
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-    scrollbar-color: #c5d3de transparent;
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-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
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-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
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-    left: 24px;
-    right: 24px;
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-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/fr/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
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-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
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-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
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-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
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-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-                            Protocole SimpleX Chat
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-                            Terminal CLI
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diff --git a/fr/invitation/index.html b/fr/invitation/index.html
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index 76fa5e7650..a2621dfae2 100644
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-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/he/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-</header>
-<div id="mobile-header">
-    <a href="/hu" class="logo flex dark:hidden ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-light.svg" alt="" srcset=""></a>
-    <a href="/hu" class="logo hidden dark:flex ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-dark.svg" alt="" srcset=""></a>
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-
-<script>
-// switch theme
-const sunIcon = document.querySelector('.sun');
-const moonIcon = document.querySelector('.moon');
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-const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
-const prismThemeLink = document.getElementById('prism-theme')
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-function updateThemeColor() {
-    const meta = document.querySelector('meta[name="theme-color"]');
-    if (meta) meta.setAttribute('content', getComputedStyle(document.body).backgroundColor);
-    const navbar = document.querySelector('header#navbar');
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-        navbar.style.transition = 'none';
-        navbar.classList.remove('open');
-        setTimeout(() => {
-            navbar.classList.add('open');
-            setTimeout(() => navbar.style.transition = '', 0);
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-
-function themeCheck() {
-    if (userTheme === 'dark' || (!userTheme && systemTheme)) {
-        document.documentElement.classList.add('dark');
-        moonIcon.classList.add('hidden');
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-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-    }
-    else{
-        sunIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
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-    updateThemeColor();
-}
-themeCheck();
-
-function themeSwitch () {
-    if (document.documentElement.classList.contains('dark')) {
-        document.documentElement.classList.remove('dark');
-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
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-        iconToggle();
-    } else {
-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
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-}
-
-const nav = document.querySelector('header#navbar');
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-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
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-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
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-        themeSwitch();
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-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        A fájlátvitelhez JavaScript szükséges.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX fájlátvitel</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Húzzon ide</p>
-          <p class="hint">vagy</p>
-          <span class="btn">válasszon ki egy fájlt</span>
-          <p class="hint">Legfeljebb 100 MB – a <a href="#join-simplex">SimpleX Chat alkalmazás</a> viszont 1 GB méretű fájlokat is támogat</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX fájlátvitel</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Letöltés</button>
-          <div class="security-note">
-            <p>Ez a fájl titkosítva van – az útválasztók soha nem „látják” a fájl tartalmát, nevét és méretét.</p>
-            <p>A titkosítási kulcs a hivatkozás kivonattöredékében található – soha nem kerül elküldésre semmilyen kiszolgálóra.</p>
-            <p>A nagyobb biztonság érdekében használja a <a href="https://simplex.chat/download">SimpleX Chat</a> alkalmazást.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Fájlok biztonságos küldése végpontok közötti titkosítással – felhasználói fiókok és nyomon követés nélkül.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Tudjon meg többet az XFTP-protokollról</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Szerezze be a SimpleX Chat alkalmazást – a legbiztonságosabb és legbizalmasabb üzenetváltó programot
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      Az imént használt fájlátvitel ugyanazt az útválasztó protokollt használja, mint a SimpleX Chat alkalmazás. Az alkalmazás végpontok közötti titkosított üzenetküldést, hang- és videohívásokat, csoportos csevegéseket és fájlok küldését teszi lehetővé. Nem szükséges hozzá felhasználói fiók, telefonszám, e-mail-cím és nem használ felhasználói profilazonosítókat sem.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/hu/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP-protokoll: a legbiztonságosabb fájlátvitel</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">Nincs szükség felhasználói fiókra</h3>
-  <p>Minden fájldarab új, véletlenszerű kulcsot használ. Az útválasztóknak nincsenek „felhasználóik” vagy „fájljaik” – rögzített méretű titkosított fájldarabokat továbbítanak.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Háromrétegű titkosítás a böngészőben</h3>
-  <p>A fájl titkosítási kulcsa csak a webcím kivonattöredékében található – a böngésző soha nem küldi el azt a kiszolgálónak. A fájlok háromrétegű titkosítással rendelkeznek: TLS-átviteli, címzettenkénti (egyedi, ideiglenes kulcs átvitelenként) és végpontok közötti titkosítással.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Független útválasztók</h3>
-  <p>Amikor a fájl töredékekre oszlik, akkor a független felek által üzemeltetett hálózati útválasztókon keresztül kerül továbbításra. Egyetlen üzemeltető sem láthatja a fájl tényleges méretét és nevét. Még ha egy útválasztó biztonsága meg is sérül, csak a rögzített méretű titkosított töredékeket „láthatja”. A fájltöredékeket a hálózati útválasztók körülbelül 48 órán át tárolják a gyorsítótárban.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Olvassa el az XFTP-protokoll leírását →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX fájlátvitel",
-    "dropZone": "Húzzon ide",
-    "dropZoneHint": "vagy",
-    "chooseFile": "válasszon ki egy fájlt",
-    "maxSizeHint": "Legfeljebb 100 MB – a <a href=\"#join-simplex\">SimpleX Chat alkalmazás</a> viszont 1 GB méretű fájlokat is támogat",
-    "encrypting": "Titkosítás…",
-    "uploading": "Feltöltés…",
-    "cancel": "Mégse",
-    "fileUploaded": "Fájl feltöltve",
-    "copy": "Másolás",
-    "copied": "Másolva!",
-    "share": "Megosztás",
-    "expiryHint": "A fájlok általában 48 óráig érhetők el.",
-    "securityNote1": "A fájl a böngészőben lett titkosítva – az útválasztók soha nem „látják” a fájl tartalmát, nevét és méretét.",
-    "securityNote2": "A titkosítási kulcs a hivatkozás kivonattöredékében található – soha nem kerül elküldésre semmilyen kiszolgálóra.",
-    "securityNote3": "A nagyobb biztonság érdekében használja a <a href=\"https://simplex.chat/download\">SimpleX Chat</a> alkalmazást.",
-    "retry": "Újra",
-    "downloading": "Letöltés…",
-    "decrypting": "Visszafejtés…",
-    "downloadComplete": "Letöltés kész",
-    "download": "Letöltés",
-    "fileTooLarge": "A fájl túl nagy (%size%). A megengedett feltölthető méret 100 MB. Az ettől nagyobb fájlok küldéséhez használja a <a href=\"#join-simplex\">SimpleX Chat alkalmazást</a>, ami legfeljebb 1 GB méretű fájlokat is támogat.",
-    "fileEmpty": "A fájl üres.",
-    "invalidLink": "Érvénytelen vagy sérült hivatkozás.",
-    "initError": "Nem sikerült előkészíteni: %error%",
-    "fileAvailable": "A fájl elérhető (~%size%)",
-    "dlSecurityNote1": "Ez a fájl titkosítva van – az útválasztók soha nem „látják” a fájl tartalmát, nevét és méretét.",
-    "dlSecurityNote2": "A titkosítási kulcs a hivatkozás kivonattöredékében található – soha nem kerül elküldésre semmilyen kiszolgálóra.",
-    "dlSecurityNote3": "A nagyobb biztonság érdekében használja a <a href=\"https://simplex.chat/download\">SimpleX Chat</a> alkalmazást.",
-    "workersRequired": "Web Workers szükséges – frissítse a böngészőjét"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
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-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
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-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
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-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
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-    scrollArea.addEventListener('scroll', checkScrollBottom);
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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diff --git a/hu/index.html b/hu/index.html
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-                        target="_blank">Protokol SMP
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-                    <li><a href="/docs/translations.html"
-                    >Terjemahkan SimpleX Chat
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Mengakses berkas Android
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Contoh chat bot
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">Terminal CLI</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
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-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
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-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
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-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/id/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
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-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
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-  // Intercept close for #xftp-protocol to add fade-out animation
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-            <hr>
+            <!-- <hr>
 
             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -144,7 +144,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/it/fdroid/index.html b/it/fdroid/index.html
index 52bf5dc7e5..2339f1b791 100644
--- a/it/fdroid/index.html
+++ b/it/fdroid/index.html
@@ -136,7 +136,7 @@
                 </a>
             </li>
 
-            <hr>
+            <!-- <hr>
 
             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -144,7 +144,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
                 <a href="javascript:void(0);">
diff --git a/it/file/index.html b/it/file/index.html
deleted file mode 100644
index 5806fb6e1b..0000000000
--- a/it/file/index.html
+++ /dev/null
@@ -1,913 +0,0 @@
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-<html lang="it"
-    
-        
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-        
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-            dir="ltr"
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-    >
-    <head>
-        <meta charset="UTF-8">
-        <script>if (localStorage.getItem('theme') === 'dark' || (!localStorage.getItem('theme') && window.matchMedia('(prefers-color-scheme: dark)').matches)) document.documentElement.classList.add('dark')</script>
-
-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
-        <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        <title>SimpleX File Transfer</title>
-        <meta name="description" content="Send files securely with end-to-end encryption"/>
-        <meta name="Content-Type" content="text/html;charset=utf-8"/>
-        
-        <meta http-equiv="onion-location" content="http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/" />
-        <meta property="og:url" content="https://simplex.chat/" />
-        
-        <meta property="og:type" content="website"/>
-        <meta property="og:title" content="SimpleX File Transfer"/>
-        <meta property="og:description" content="Send files securely with end-to-end encryption"/>
-        <meta property="og:image" content="https://simplex.chat/img/share_simplex.jpg"/>
-        <meta name="twitter:card" content="summary"/>
-        <link rel="icon" type="image/png" sizes="96x96" href="/img/favicon.ico"/>
-        <meta name="theme-color" content="#F3FAFF">
-
-        <link rel="stylesheet" href="/css/swiper-bundle.min.css">
-        <link rel="stylesheet" href="/css/blog.css">
-        <link href="/css/tailwind.css" rel="stylesheet"/>
-        <link rel="stylesheet" href="/css/style.css">
-        <link rel="stylesheet" href="/css/design3-nav.css">
-        <script async defer src="https://buttons.github.io/buttons.js"></script>
-        <script src="/js/flag-anchor.js"></script>
-        
-    </head>
-    <body class="bg-[#F3FAFF] dark:bg-[#000832]">
-        
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-<header id="navbar">
-    <a href="/it" class="logo logo-light ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-light.png" alt="logo"></a>
-    <a href="/it" class="logo logo-dark ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-dark.png" alt="logo"></a>
-
-    <nav id="menu">
-        <ul>
-            <li class="nav-link ">
-                <a href="/it">
-                    <span class="nav-link-text">Home</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link ">
-                <a href="/directory/">
-                    <span class="nav-link-text">Directory</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link send-file active">
-                <a href="/file/">
-                    <span class="nav-link-text">Invia file</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link">
-                <a href="javascript:void(0);">
-                    <span class="">Guida</span>
-                    <span href="" id="btn-mobile">
-                        <svg viewBox="0 0 10 6" xmlns="http://www.w3.org/2000/svg">
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-                <ul class="sub-menu">
-                    
-                        <li><a href="/docs/guide/readme.html" class="">Avvio rapido</a></li>
-                    
-                        <li><a href="/docs/guide/send-messages.html" class="">Inviare messaggi</a></li>
-                    
-                        <li><a href="/docs/guide/secret-groups.html" class="">Gruppi segreti</a></li>
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-                        <li><a href="/docs/guide/managing-data.html" class="">Gestione dei dati</a></li>
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-                        <li><a href="/docs/guide/audio-video-calls.html" class="">Chiamate audio e video</a></li>
-                    
-                        <li><a href="/docs/guide/privacy-security.html" class="">Privacy e sicurezza</a></li>
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-                        <li><a href="/docs/guide/app-settings.html" class="">Impostazioni dell'app</a></li>
-                    
-                        <li><a href="/docs/guide/making-connections.html" class="">Creare connessioni</a></li>
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-
-            <hr>
-
-            <li class="nav-link">
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-                    <span class="">Riferimenti</span>
-                    <span href="" id="btn-mobile">
-                        <svg viewBox="0 0 10 6" xmlns="http://www.w3.org/2000/svg">
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-
-                <ul class="sub-menu">
-                    <li><a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/overview-tjr.md"
-                        target="_blank">Whitepaper
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-                    <li><a href="/privacy">Informativa sulla privacy</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/simplex-messaging.md"
-                        target="_blank">Protocollo SMP
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-
-                    <hr>
-
-                    
-                        <li><a href="/docs/simplex.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Rete di SimpleX</a></li>
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-                    
-                        <li><a href="/docs/directory.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Directory di SimpleX</a></li>
-                    
-                        <li><a href="/docs/android.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Accesso ai file Android</a></li>
-                    
-                        <li><a href="/docs/server.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Ospita un server SMP</a></li>
-                    
-                        <li><a href="/docs/xftp-server.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Ospita un server XFTP</a></li>
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-                        <li><a href="/docs/webrtc.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Server WebRTC</a></li>
-                    
-                        <li><a href="/downloads/" class=" lg:px-[20px] inline-block whitespace-nowrap">Download</a></li>
-                    
-                        <li><a href="/reproduce/" class=" lg:px-[20px] inline-block whitespace-nowrap">Verifica e riproduci le build</a></li>
-                    
-                        <li><a href="/transparency/" class=" lg:px-[20px] inline-block whitespace-nowrap">Trasparenza</a></li>
-                    
-                        <li><a href="/security/" class=" lg:px-[20px] inline-block whitespace-nowrap">Sicurezza</a></li>
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-                        <li><a href="/faq/" class=" lg:px-[20px] inline-block whitespace-nowrap">Domande frequenti</a></li>
-                    
-
-                    <hr>
-
-                    <li><a href="/docs/translations.html"
-                    >Traduci SimpleX Chat
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Accesso ai file Android
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Esempio di chat bot
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-                    <li><a href="/docs/cli.html">Terminale CLI</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
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-
-            <hr>
-
-            <li class="nav-link ">
-                <a href="/blog">
-                    <span class="nav-link-text">Blog</span>
-                </a>
-            </li>
-        </ul>
-    </nav>
-
-    <div class="right-links">
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-            <a class="box-btn token md:hidden" href="/donate">
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-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-        iconToggle();
-    } else {
-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-        iconToggle();
-    }
-    updateThemeColor();
-}
-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
-        }
-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
-        }
-    }
-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript è necessario per il trasferimento di file.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">Trasferimento file di SimpleX</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Trascina un file qui</p>
-          <p class="hint">o</p>
-          <span class="btn">Scegli file</span>
-          <p class="hint">Max 100 MB - <a href="#join-simplex">L'app SimpleX Chat</a> supporta file fino a 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>Trasferimento file di SimpleX</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Scarica</button>
-          <div class="security-note">
-            <p>Questo file è crittografato: gli instradatori di dati non vedono mai il contenuto del file, il nome o la dimensione.</p>
-            <p>La chiave di crittografia è nel frammento hash del link, non viene mai inviata ad alcun server.</p>
-            <p>Per una migliore sicurezza, usa l'app <a href="https://simplex.chat/download">SimpleX Chat</a>.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Invia file in modo sicuro con crittografia end-to-end: nessun account, nessun monitoraggio.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Maggiori informazioni sul protocollo XFTP</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Scarica SimpleX Chat — il messenger più sicuro e privato
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      Il trasferimento di file appena avviato usa lo stesso protocollo di instradamento dati di SimpleX Chat. L'app offre messaggi crittografati end-to-end, chiamate vocali e video, gruppi e invio di file. Nessun account. Nessun telefono. Nessuna email. Nessun ID utente.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/it/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">Protocollo XFTP: il trasferimento di file più sicuro</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">Nessun account richiesto</h3>
-  <p>Ogni frammento di file usa una nuova chiave casuale. Gli instradatori di dati non hanno "utenti" o "file": trasferiscono frammenti di file crittografati di dimensioni fisse.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Crittografia tripla nel tuo browser</h3>
-  <p>La chiave di crittografia dei file è presente solo nel frammento dell'hash dell'URL: il browser non la invia mai a un server. Ci sono 3 strati di crittografia: trasporto TLS, crittografia per-destinatario (chiave effimera unica per trasferimento) e crittografia file end-to-end.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Instradatori indipendenti di dati</h3>
-  <p>Quando il file è diviso in frammenti, viene inviato tramite instradatori di rete operati da parti indipendenti. Nessun operatore può vedere la vera dimensione o il nome del file. Anche se un instradatore venisse compromesso, potrà vedere solo frammenti cifrati di dimensione fissa. I frammenti di file restano in cache dagli instradatori di rete per circa 48 ore.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Leggi le specifiche del protocollo XFTP →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "Trasferimento file di SimpleX",
-    "dropZone": "Trascina un file qui",
-    "dropZoneHint": "o",
-    "chooseFile": "Scegli file",
-    "maxSizeHint": "Max 100 MB - <a href=\"#join-simplex\">L'app SimpleX Chat</a> supporta file fino a 1 GB",
-    "encrypting": "Crittografia…",
-    "uploading": "Caricamento…",
-    "cancel": "Annulla",
-    "fileUploaded": "File caricato",
-    "copy": "Copia",
-    "copied": "Copiato!",
-    "share": "Condividi",
-    "expiryHint": "I file sono generalmente disponibili per 48 ore.",
-    "securityNote1": "Il file è stato crittografato nel browser: gli instradatori di dati non vedono mai il contenuto, il nome o la dimensione del file.",
-    "securityNote2": "La chiave di crittografia è nel frammento hash del link, non viene mai inviata ad alcun server.",
-    "securityNote3": "Per una migliore sicurezza, usa l'app <a href=\"https://simplex.chat/download\">SimpleX Chat</a>.",
-    "retry": "Riprova",
-    "downloading": "Scaricamento…",
-    "decrypting": "Decifrazione…",
-    "downloadComplete": "Scaricamento completato",
-    "download": "Scarica",
-    "fileTooLarge": "File troppo grande (%size%). Il massimo è 100 MB. L'app <a href=\"#join-simplex\">SimpleX</a> supporta file fino a 1 GB.",
-    "fileEmpty": "Il file è vuoto.",
-    "invalidLink": "Link non valido o danneggiato.",
-    "initError": "Inizializzazione fallita: %error%",
-    "fileAvailable": "File disponibile (~%size%)",
-    "dlSecurityNote1": "Questo file è crittografato: gli instradatori di dati non vedono mai il contenuto del file, il nome o la dimensione.",
-    "dlSecurityNote2": "La chiave di crittografia è nel frammento hash del link, non viene mai inviata ad alcun server.",
-    "dlSecurityNote3": "Per una migliore sicurezza, usa l'app <a href=\"https://simplex.chat/download\">SimpleX Chat</a>.",
-    "workersRequired": "Web worker necessari, aggiorna il browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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diff --git a/it/index.html b/it/index.html
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-
-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
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-        <meta name="description" content="Send files securely with end-to-end encryption"/>
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-        <meta http-equiv="onion-location" content="http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/" />
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-        <ul>
-            <li class="nav-link ">
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-            <li class="nav-link ">
-                <a href="/directory/">
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-            <hr>
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-            <li class="nav-link send-file active">
-                <a href="/file/">
-                    <span class="nav-link-text">ファイルを送信</span>
-                </a>
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-                    <span class="">ガイド</span>
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-                        <li><a href="/security/" class=" lg:px-[20px] inline-block whitespace-nowrap">セキュリティ</a></li>
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-                        <li><a href="/faq/" class=" lg:px-[20px] inline-block whitespace-nowrap">よくある質問</a></li>
-                    
-
-                    <hr>
-
-                    <li><a href="/docs/translations.html"
-                    >SimpleX チャットを翻訳する
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Android ファイルへのアクセス
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">チャットボットの例
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">ターミナル CLI</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                </ul>
-            </li>
-
-            <hr>
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-            <li class="nav-link ">
-                <a href="/blog">
-                    <span class="nav-link-text">ブログ</span>
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-    </nav>
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-        <button id="cross-btn" class="nav-toggle-btn">
-            <svg id="cross" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-            <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z" />
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-</header>
-<div id="mobile-header">
-    <a href="/ja" class="logo flex dark:hidden ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-light.svg" alt="" srcset=""></a>
-    <a href="/ja" class="logo hidden dark:flex ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-dark.svg" alt="" srcset=""></a>
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-    <button id="hamburger" class="nav-toggle-btn">
-        <svg viewBox="0 0 100 80" width="36" height="36">
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-</div>
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-
-<script>
-// switch theme
-const sunIcon = document.querySelector('.sun');
-const moonIcon = document.querySelector('.moon');
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-const userTheme = localStorage.getItem('theme');
-const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
-const prismThemeLink = document.getElementById('prism-theme')
-
-function iconToggle () {
-    sunIcon.classList.toggle('hidden');
-    moonIcon.classList.toggle('hidden');
-}
-
-function updateThemeColor() {
-    const meta = document.querySelector('meta[name="theme-color"]');
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-    const navbar = document.querySelector('header#navbar');
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-        navbar.style.transition = 'none';
-        navbar.classList.remove('open');
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-
-function themeCheck() {
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-        document.documentElement.classList.add('dark');
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-themeCheck();
-
-function themeSwitch () {
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-
-const nav = document.querySelector('header#navbar');
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-window.addEventListener('click',(e)=>{
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-        themeSwitch();
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-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/ja/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
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-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
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-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
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-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
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-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
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-            </svg>
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-    </div>
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-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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index 1b3783f631..31562ef5c1 100644
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+++ b/ja/index.html
@@ -182,7 +182,7 @@
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diff --git a/ja/invitation/index.html b/ja/invitation/index.html
index 29015f312d..3153f5c35a 100644
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@@ -136,7 +136,7 @@
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@@ -144,7 +144,7 @@
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diff --git a/ja/old/index.html b/ja/old/index.html
index dc794629d2..37c71a9ad5 100644
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index bec8ff7e86..62f109eaee 100644
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diff --git a/jobs/index.html b/jobs/index.html
index 2bc5191df6..89b6030cf8 100644
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@@ -126,7 +126,7 @@
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index 06e850419a..de862cfee4 100644
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@@ -136,7 +136,7 @@
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@@ -144,7 +144,7 @@
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index 03b1b7b4c6..63414b043b 100644
--- a/nl/contact/index.html
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@@ -136,7 +136,7 @@
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deleted file mode 100644
index faeb6551c5..0000000000
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-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/nl/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-
-        <button id="cross-btn" class="nav-toggle-btn">
-            <svg id="cross" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-            <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z" />
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-        </button>
-    </div>
-</header>
-<div id="mobile-header">
-    <a href="/pl" class="logo flex dark:hidden ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-light.svg" alt="" srcset=""></a>
-    <a href="/pl" class="logo hidden dark:flex ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-dark.svg" alt="" srcset=""></a>
-
-    <button id="hamburger" class="nav-toggle-btn">
-        <svg viewBox="0 0 100 80" width="36" height="36">
-            <rect width="100" height="15"></rect>
-            <rect y="30" width="100" height="15"></rect>
-            <rect y="60" width="100" height="15"></rect>
-        </svg>
-    </button>
-</div>
-
-
-<script>
-// switch theme
-const sunIcon = document.querySelector('.sun');
-const moonIcon = document.querySelector('.moon');
-
-const userTheme = localStorage.getItem('theme');
-const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
-const prismThemeLink = document.getElementById('prism-theme')
-
-function iconToggle () {
-    sunIcon.classList.toggle('hidden');
-    moonIcon.classList.toggle('hidden');
-}
-
-function updateThemeColor() {
-    const meta = document.querySelector('meta[name="theme-color"]');
-    if (meta) meta.setAttribute('content', getComputedStyle(document.body).backgroundColor);
-    const navbar = document.querySelector('header#navbar');
-    if (navbar && navbar.classList.contains('open')) {
-        navbar.style.transition = 'none';
-        navbar.classList.remove('open');
-        setTimeout(() => {
-            navbar.classList.add('open');
-            setTimeout(() => navbar.style.transition = '', 0);
-        }, 0);
-    }
-}
-
-function themeCheck() {
-    if (userTheme === 'dark' || (!userTheme && systemTheme)) {
-        document.documentElement.classList.add('dark');
-        moonIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-    }
-    else{
-        sunIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-    }
-    updateThemeColor();
-}
-themeCheck();
-
-function themeSwitch () {
-    if (document.documentElement.classList.contains('dark')) {
-        document.documentElement.classList.remove('dark');
-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-        iconToggle();
-    } else {
-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-        iconToggle();
-    }
-    updateThemeColor();
-}
-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
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-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
-        }
-    }
-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        Do przesyłania plików wymagana jest obsługa języka JavaScript.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">Transfer plików SimpleX</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Przeciągnij i upuść plik tutaj</p>
-          <p class="hint">lub</p>
-          <span class="btn">Wybierz plik</span>
-          <p class="hint">Maksymalnie 100 MB - <a href="#join-simplex">aplikacja SimpleX Chat</a> obsługuje pliki o rozmiarze do 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>Transfer plików SimpleX</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Pobierz</button>
-          <div class="security-note">
-            <p>Ten plik jest zaszyfrowany – routery danych nigdy nie widzą zawartości pliku, jego nazwy ani rozmiaru.</p>
-            <p>Klucz szyfrujący znajduje się w fragmencie skrótu linku – nigdy nie jest wysyłany do żadnego serwera.</p>
-            <p>Aby zapewnić większe bezpieczeństwo, użyj aplikacji <a href="https://simplex.chat/download">SimpleX Chat</a>.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Wysyłaj pliki bezpiecznie dzięki szyfrowaniu typu end-to-end — bez kont, bez śledzenia.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Dowiedz się więcej o protokole XFTP</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Pobierz SimpleX Chat — najbezpieczniejszy i najbardziej prywatny komunikator
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      Przesyłanie plików, z którego właśnie skorzystałeś, wykorzystuje ten sam protokół routingu danych, co SimpleX Chat. Aplikacja oferuje szyfrowane wiadomości, połączenia głosowe i wideo, grupy oraz wysyłanie plików. Bez konta. Bez telefonu. Bez adresu e-mail. Bez identyfikatorów profilu użytkownika.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/pl/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">Protokół XFTP: najbezpieczniejszy transfer plików</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">Nie jest wymagane konto</h3>
-  <p>Każdy fragment pliku wykorzystuje nowy losowy klucz. Routery danych nie mają „użytkowników” ani „plików” – przesyłają zaszyfrowane fragmenty plików o stałych rozmiarach.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Potrójne szyfrowanie w przeglądarce</h3>
-  <p>Klucz szyfrowania plików znajduje się wyłącznie we fragmencie skrótu adresu URL – przeglądarka nigdy nie wysyła go do serwera. Istnieją trzy warstwy szyfrowania: transport TLS, szyfrowanie po-odbiorcy (unikalny klucz tymczasowy dla każdego transferu) oraz szyfrowanie plików typu end-to-end.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Niezależne routery danych</h3>
-  <p>Gdy plik jest dzielony na fragmenty, jest on wysyłany przez routery sieciowe obsługiwane przez niezależne podmioty. Żaden operator nie może zobaczyć rzeczywistego rozmiaru ani nazwy pliku. Nawet jeśli router zostanie naruszony, może on zobaczyć tylko zaszyfrowane fragmenty o stałym rozmiarze. Fragmenty plików są przechowywane w pamięci podręcznej routerów sieciowych przez około 48 godzin.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Zapoznaj się ze specyfikacją protokołu XFTP →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
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-                        </div>
-                    </div>
-                
-            </div>
-
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-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "Transfer plików SimpleX",
-    "dropZone": "Przeciągnij i upuść plik tutaj",
-    "dropZoneHint": "lub",
-    "chooseFile": "Wybierz plik",
-    "maxSizeHint": "Maksymalnie 100 MB - <a href=\"#join-simplex\">aplikacja SimpleX Chat</a> obsługuje pliki o rozmiarze do 1 GB",
-    "encrypting": "Szyfrowanie…",
-    "uploading": "Wysyłanie…",
-    "cancel": "Anuluj",
-    "fileUploaded": "Plik wysłany",
-    "copy": "Kopiuj",
-    "copied": "Skopiowano!",
-    "share": "Udostępnij",
-    "expiryHint": "Pliki są zazwyczaj dostępne przez 48 godzin.",
-    "securityNote1": "Twój plik został zaszyfrowany w przeglądarce – routery danych nigdy nie widzą treści plików, ich nazw ani rozmiarów.",
-    "securityNote2": "Klucz szyfrujący znajduje się w fragmencie skrótu linku – nigdy nie jest wysyłany do żadnego serwera.",
-    "securityNote3": "Aby zapewnić większe bezpieczeństwo, użyj aplikacji <a href=\"https://simplex.chat/download\">SimpleX Chat</a>.",
-    "retry": "Ponów",
-    "downloading": "Pobieranie…",
-    "decrypting": "Odszyfrowywanie…",
-    "downloadComplete": "Pobieranie zakończone",
-    "download": "Pobierz",
-    "fileTooLarge": "Plik jest zbyt duży (%size%). Maksymalny rozmiar to 100 MB. Aplikacja <a href=\"#join-simplex\">SimpleX</a> obsługuje pliki o rozmiarze do 1 GB.",
-    "fileEmpty": "Plik jest pusty.",
-    "invalidLink": "Nieprawidłowy lub uszkodzony link.",
-    "initError": "Nie udało się zainicjować: %error%",
-    "fileAvailable": "Plik dostępny (~%size%)",
-    "dlSecurityNote1": "Ten plik jest zaszyfrowany – routery danych nigdy nie widzą zawartości pliku, jego nazwy ani rozmiaru.",
-    "dlSecurityNote2": "Klucz szyfrujący znajduje się w fragmencie skrótu linku – nigdy nie jest wysyłany do żadnego serwera.",
-    "dlSecurityNote3": "Aby zapewnić większe bezpieczeństwo, użyj aplikacji <a href=\"https://simplex.chat/download\">SimpleX Chat</a>.",
-    "workersRequired": "Wymagane Web Workers — zaktualizuj przeglądarkę"
-  }
-</script>
-
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-    </div>
-</section>
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diff --git a/pl/index.html b/pl/index.html
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                 </a>
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@@ -190,7 +190,7 @@
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diff --git a/pl/invitation/index.html b/pl/invitation/index.html
index 609d1945f8..ee4ac65af8 100644
--- a/pl/invitation/index.html
+++ b/pl/invitation/index.html
@@ -136,7 +136,7 @@
                 </a>
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@@ -136,7 +136,7 @@
                 </a>
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diff --git a/pl/old/index.html b/pl/old/index.html
index 42eca3044e..79ac97a565 100644
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+++ b/pl/old/index.html
@@ -136,7 +136,7 @@
                 </a>
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diff --git a/pl/why/index.html b/pl/why/index.html
index a3fb56afd4..c9d97eedba 100644
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@@ -136,7 +136,7 @@
                 </a>
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diff --git a/privacy/index.html b/privacy/index.html
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diff --git a/pt_BR/contact/index.html b/pt_BR/contact/index.html
index e4f5b23edb..49c2c312de 100644
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@@ -136,7 +136,7 @@
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diff --git a/pt_BR/fdroid/index.html b/pt_BR/fdroid/index.html
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diff --git a/pt_BR/file/index.html b/pt_BR/file/index.html
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-<!DOCTYPE html>
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-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
-        <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        <title>SimpleX File Transfer</title>
-        <meta name="description" content="Send files securely with end-to-end encryption"/>
-        <meta name="Content-Type" content="text/html;charset=utf-8"/>
-        
-        <meta http-equiv="onion-location" content="http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/" />
-        <meta property="og:url" content="https://simplex.chat/" />
-        
-        <meta property="og:type" content="website"/>
-        <meta property="og:title" content="SimpleX File Transfer"/>
-        <meta property="og:description" content="Send files securely with end-to-end encryption"/>
-        <meta property="og:image" content="https://simplex.chat/img/share_simplex.jpg"/>
-        <meta name="twitter:card" content="summary"/>
-        <link rel="icon" type="image/png" sizes="96x96" href="/img/favicon.ico"/>
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-        <link rel="stylesheet" href="/css/style.css">
-        <link rel="stylesheet" href="/css/design3-nav.css">
-        <script async defer src="https://buttons.github.io/buttons.js"></script>
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-<header id="navbar">
-    <a href="/pt_BR" class="logo logo-light ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-light.png" alt="logo"></a>
-    <a href="/pt_BR" class="logo logo-dark ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-dark.png" alt="logo"></a>
-
-    <nav id="menu">
-        <ul>
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-            <hr>
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-            <li class="nav-link ">
-                <a href="/directory/">
-                    <span class="nav-link-text">Diretório</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link send-file active">
-                <a href="/file/">
-                    <span class="nav-link-text">Enviar arquivo</span>
-                </a>
-            </li>
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-            <hr>
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-            <li class="nav-link">
-                <a href="javascript:void(0);">
-                    <span class="">Manual</span>
-                    <span href="" id="btn-mobile">
-                        <svg viewBox="0 0 10 6" xmlns="http://www.w3.org/2000/svg">
-                            <path fill-rule="evenodd" clip-rule="evenodd" d="M1.50447 0.902966C1.21571 0.627397 0.747525 0.627397 0.458761 0.902966C0.169996 1.17853 0.169996 1.62532 0.458761 1.90089L4.21933 5.48961C4.25543 5.52406 4.29433 5.5542 4.33533 5.58003C4.62234 5.76088 5.01237 5.73074 5.26504 5.48961L9.02561 1.90089C9.31438 1.62532 9.31438 1.17853 9.02561 0.902966C8.73685 0.627397 8.26867 0.627397 7.97991 0.902966L4.74219 3.99273L1.50447 0.902966Z"/>
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-                    </span>
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-
-                <ul class="sub-menu">
-                    
-                        <li><a href="/docs/guide/readme.html" class="">Início rápido</a></li>
-                    
-                        <li><a href="/docs/guide/send-messages.html" class="">Enviando mensagens</a></li>
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-                        <li><a href="/docs/guide/secret-groups.html" class="">Grupos secretos</a></li>
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-                        <li><a href="/docs/guide/chat-profiles.html" class="">Perfis de chat</a></li>
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-                    
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-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
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-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
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-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
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-
-  .file-proto-link {
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-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/pt_BR/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
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-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-            <hr>
+            <!-- <hr>
 
             <li class="nav-link send-file ">
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@@ -135,7 +135,7 @@
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+            <hr> -->
 
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diff --git a/ro/contact/index.html b/ro/contact/index.html
index a13b38e435..51d133ea20 100644
--- a/ro/contact/index.html
+++ b/ro/contact/index.html
@@ -132,7 +132,7 @@
                 </a>
             </li>
 
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+            <!-- <hr>
 
             <li class="nav-link send-file ">
                 <a href="/file/">
@@ -140,7 +140,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
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diff --git a/ro/fdroid/index.html b/ro/fdroid/index.html
index 255855cca0..a5399ba9fb 100644
--- a/ro/fdroid/index.html
+++ b/ro/fdroid/index.html
@@ -132,7 +132,7 @@
                 </a>
             </li>
 
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+            <!-- <hr>
 
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                 <a href="/file/">
@@ -140,7 +140,7 @@
                 </a>
             </li>
 
-            <hr>
+            <hr> -->
 
             <li class="nav-link">
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diff --git a/ro/file/index.html b/ro/file/index.html
deleted file mode 100644
index 6ef1d39495..0000000000
--- a/ro/file/index.html
+++ /dev/null
@@ -1,909 +0,0 @@
-<!DOCTYPE html>
-<html lang="ro"
-    
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-    <head>
-        <meta charset="UTF-8">
-        <script>if (localStorage.getItem('theme') === 'dark' || (!localStorage.getItem('theme') && window.matchMedia('(prefers-color-scheme: dark)').matches)) document.documentElement.classList.add('dark')</script>
-
-        <meta http-equiv="X-UA-Compatible" content="IE=edge">
-        <meta name="viewport" content="width=device-width, initial-scale=1.0">
-        <title>SimpleX File Transfer</title>
-        <meta name="description" content="Send files securely with end-to-end encryption"/>
-        <meta name="Content-Type" content="text/html;charset=utf-8"/>
-        
-        <meta http-equiv="onion-location" content="http://isdb4l77sjqoy2qq7ipum6x3at6hyn3jmxfx4zdhc72ufbmuq4ilwkqd.onion/" />
-        <meta property="og:url" content="https://simplex.chat/" />
-        
-        <meta property="og:type" content="website"/>
-        <meta property="og:title" content="SimpleX File Transfer"/>
-        <meta property="og:description" content="Send files securely with end-to-end encryption"/>
-        <meta property="og:image" content="https://simplex.chat/img/share_simplex.jpg"/>
-        <meta name="twitter:card" content="summary"/>
-        <link rel="icon" type="image/png" sizes="96x96" href="/img/favicon.ico"/>
-        <meta name="theme-color" content="#F3FAFF">
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-        <link rel="stylesheet" href="/css/style.css">
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-        <script async defer src="https://buttons.github.io/buttons.js"></script>
-        <script src="/js/flag-anchor.js"></script>
-        
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-    <body class="bg-[#F3FAFF] dark:bg-[#000832]">
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-<header id="navbar">
-    <a href="/ro" class="logo logo-light ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-light.png" alt="logo"></a>
-    <a href="/ro" class="logo logo-dark ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-dark.png" alt="logo"></a>
-
-    <nav id="menu">
-        <ul>
-            <li class="nav-link ">
-                <a href="/ro">
-                    <span class="nav-link-text">Acasă</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link ">
-                <a href="/directory/">
-                    <span class="nav-link-text">Directory</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link send-file active">
-                <a href="/file/">
-                    <span class="nav-link-text">Send file</span>
-                </a>
-            </li>
-
-            <hr>
-
-            <li class="nav-link">
-                <a href="javascript:void(0);">
-                    <span class="">Guide</span>
-                    <span href="" id="btn-mobile">
-                        <svg viewBox="0 0 10 6" xmlns="http://www.w3.org/2000/svg">
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-
-                <ul class="sub-menu">
-                    
-                        <li><a href="/docs/guide/readme.html" class="">Quick start</a></li>
-                    
-                        <li><a href="/docs/guide/send-messages.html" class="">Sending messages</a></li>
-                    
-                        <li><a href="/docs/guide/secret-groups.html" class="">Secret groups</a></li>
-                    
-                        <li><a href="/docs/guide/chat-profiles.html" class="">Chat profiles</a></li>
-                    
-                        <li><a href="/docs/guide/managing-data.html" class="">Managing data</a></li>
-                    
-                        <li><a href="/docs/guide/audio-video-calls.html" class="">Audio & video Calls</a></li>
-                    
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-                    
-                        <li><a href="/docs/guide/making-connections.html" class="">Making connections</a></li>
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-
-            <hr>
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-                    <li><a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/overview-tjr.md"
-                        target="_blank">Whitepaper
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-                        target="_blank">Protocolul SMP
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
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-
-                    <hr>
-
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-                    
-                        <li><a href="/docs/android.html" class=" lg:px-[20px] inline-block whitespace-nowrap">Accessing Android files</a></li>
-                    
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-                    
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-                    
-                        <li><a href="/docs/webrtc.html" class=" lg:px-[20px] inline-block whitespace-nowrap">WebRTC servers</a></li>
-                    
-                        <li><a href="/downloads/" class=" lg:px-[20px] inline-block whitespace-nowrap">Downloads</a></li>
-                    
-                        <li><a href="/reproduce/" class=" lg:px-[20px] inline-block whitespace-nowrap">Verify & reproduce builds</a></li>
-                    
-                        <li><a href="/transparency/" class=" lg:px-[20px] inline-block whitespace-nowrap">Transparency</a></li>
-                    
-                        <li><a href="/security/" class=" lg:px-[20px] inline-block whitespace-nowrap">Security</a></li>
-                    
-                        <li><a href="/faq/" class=" lg:px-[20px] inline-block whitespace-nowrap">FAQ</a></li>
-                    
-
-                    <hr>
-
-                    <li><a href="/docs/translations.html"
-                    >Translate SimpleX Chat
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Accessing Android files
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Exemplu de bot de chat
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">Terminal CLI</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
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-            <li class="nav-link ">
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-
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-        
-            <a class="box-btn token md:hidden" href="/donate">
-                Donează
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-        sunIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-    }
-    updateThemeColor();
-}
-themeCheck();
-
-function themeSwitch () {
-    if (document.documentElement.classList.contains('dark')) {
-        document.documentElement.classList.remove('dark');
-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
-        }
-        iconToggle();
-    } else {
-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
-        }
-        iconToggle();
-    }
-    updateThemeColor();
-}
-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
-    if(e.target.closest('.nav-link')){
-        if(e.target.closest('.nav-link').classList.contains('active')){
-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
-        }
-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
-        }
-    }
-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/ro/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-                        <li><a href="/faq/" class=" lg:px-[20px] inline-block whitespace-nowrap">Часто задаваемые вопросы</a></li>
-                    
-
-                    <hr>
-
-                    <li><a href="/docs/translations.html"
-                    >Перевести SimpleX Chat
-                    </a></li>
-                    <li><a href="/docs/android.html"
-                    >Доступ к файлам в версии для Android
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/blob/stable/apps/simplex-bot-advanced/Main.hs"
-                        target="_blank">Пример Чат бота
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="https://github.com/simplex-chat/simplex-chat/tree/stable/packages/simplex-chat-client/typescript"
-                        target="_blank">TypeScript SDK
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                    <li><a href="/docs/cli.html">Приложение для терминала (CLI)</a></li>
-                    <li><a href="https://github.com/simplex-chat/simplexmq"
-                        target="_blank">SimpleXMQ
-                        <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg>
-                    </a></li>
-                </ul>
-            </li>
-
-            <hr>
-
-            <li class="nav-link ">
-                <a href="/blog">
-                    <span class="nav-link-text">Блог</span>
-                </a>
-            </li>
-        </ul>
-    </nav>
-
-    <div class="right-links">
-        
-            <a class="box-btn token md:hidden" href="/donate">
-                Пожертвовать
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-            <path d="M225.368 385.712C222.968 387.046 219.368 390.112 217.368 392.646L213.768 397.312V426.379C213.768 458.246 213.901 458.779 222.968 465.446C228.168 469.312 240.701 469.312 245.901 465.446C254.834 458.779 255.101 457.979 255.501 428.246C256.034 397.579 255.234 394.379 246.834 387.979C241.101 383.579 231.634 382.512 225.368 385.712Z"/>
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-
-            <svg class="moon" width="469" height="469" viewBox="5 5 20 23" xmlns="http://www.w3.org/2000/svg">
-                <path d="M10.895 7.574c0 7.55 5.179 13.67 11.567 13.67 1.588 0 3.101-0.38 4.479-1.063-1.695 4.46-5.996 7.636-11.051 7.636-6.533 0-11.83-5.297-11.83-11.83 0-4.82 2.888-8.959 7.023-10.803-0.116 0.778-0.188 1.573-0.188 2.39z"></path>
-            </svg>
-        </button>
-
-        
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-        <button id="cross-btn" class="nav-toggle-btn">
-            <svg id="cross" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-            <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z" />
-        </svg>
-        </button>
-    </div>
-</header>
-<div id="mobile-header">
-    <a href="/ru" class="logo flex dark:hidden ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-light.svg" alt="" srcset=""></a>
-    <a href="/ru" class="logo hidden dark:flex ltr:mr-auto rtl:ml-auto"><img src="/img/new/logo-symbol-dark.svg" alt="" srcset=""></a>
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-    <button id="hamburger" class="nav-toggle-btn">
-        <svg viewBox="0 0 100 80" width="36" height="36">
-            <rect width="100" height="15"></rect>
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-    </button>
-</div>
-
-
-<script>
-// switch theme
-const sunIcon = document.querySelector('.sun');
-const moonIcon = document.querySelector('.moon');
-
-const userTheme = localStorage.getItem('theme');
-const systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
-const prismThemeLink = document.getElementById('prism-theme')
-
-function iconToggle () {
-    sunIcon.classList.toggle('hidden');
-    moonIcon.classList.toggle('hidden');
-}
-
-function updateThemeColor() {
-    const meta = document.querySelector('meta[name="theme-color"]');
-    if (meta) meta.setAttribute('content', getComputedStyle(document.body).backgroundColor);
-    const navbar = document.querySelector('header#navbar');
-    if (navbar && navbar.classList.contains('open')) {
-        navbar.style.transition = 'none';
-        navbar.classList.remove('open');
-        setTimeout(() => {
-            navbar.classList.add('open');
-            setTimeout(() => navbar.style.transition = '', 0);
-        }, 0);
-    }
-}
-
-function themeCheck() {
-    if (userTheme === 'dark' || (!userTheme && systemTheme)) {
-        document.documentElement.classList.add('dark');
-        moonIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-dark.min.css')
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-    else{
-        sunIcon.classList.add('hidden');
-        if (prismThemeLink) {
-            prismThemeLink.setAttribute('href','/css/prism-light.min.css')
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-    updateThemeColor();
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-themeCheck();
-
-function themeSwitch () {
-    if (document.documentElement.classList.contains('dark')) {
-        document.documentElement.classList.remove('dark');
-        localStorage.setItem('theme', 'light');
-        if(prismThemeLink){
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-        document.documentElement.classList.add('dark');
-        localStorage.setItem('theme', 'dark');
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-
-const nav = document.querySelector('header#navbar');
-
-window.addEventListener('click',(e)=>{
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-            e.target.closest('.nav-link').classList.remove('active');
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-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
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-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/ru/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
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-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
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-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
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-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
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-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
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-            </svg>
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-    </div>
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-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-                            Приложение для терминала (CLI)
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index e93b44d785..8538d24dac 100644
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@@ -182,7 +182,7 @@
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diff --git a/ru/invitation/index.html b/ru/invitation/index.html
index 479e34716b..d1d18592d1 100644
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index 1ad7dc4329..af3b89ef07 100644
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-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/tr/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
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-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/uk/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
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-                
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-    "copied": "Copied!",
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-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
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-    "invalidLink": "Invalid or corrupted link.",
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-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
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-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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-                        target="_blank">聊天机器人示例
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-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
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-
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-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
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-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
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-    display: flex;
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-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
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-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        文件传输需要启用 JavaScript。
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX 文件传输</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>将文件拖放到此处</p>
-          <p class="hint">或</p>
-          <span class="btn">选择文件</span>
-          <p class="hint">最大支持 100 MB - <a href="#join-simplex">SimpleX Chat 应用</a> 支持最大 1 GB 的文件</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX 文件传输</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">下载</button>
-          <div class="security-note">
-            <p>此文件已加密——数据路由器永远看不到文件内容、名称或大小。</p>
-            <p>加密密钥位于链接的哈希片段中——它永远不会发送到任何服务器。</p>
-            <p>为了获得更好的安全性，请使用<a href="https://simplex.chat/download">SimpleX Chat</a>应用程序。</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">使用端到端加密安全发送文件——无需注册账户，不会追踪。</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">了解更多关于 XFTP 协议的信息</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      获取 SimpleX Chat——最安全、最私密的即时通讯工具
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      您刚才使用的文件传输功能与 SimpleX Chat 使用相同的数据路由协议。该应用提供端到端加密的消息传递、语音和视频通话、群组功能以及文件发送功能。无需注册账号，无需电话号码，无需邮箱，也无需用户个人资料 ID。
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/zh_Hans/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP协议：最安全的文件传输协议</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
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-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">无需注册账号</h3>
-  <p>每个文件片段都使用一个新的随机密钥。数据路由器没有“用户”或“文件”的概念——它们传输的是固定大小的加密文件片段。</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">浏览器中采用三重加密</h3>
-  <p>文件加密密钥仅存在于 URL 哈希片段中——您的浏览器绝不会将其发送给服务器。加密过程包含三层：TLS 传输层、每个接收者加密层（每次传输使用唯一的临时密钥）以及文件端到端加密层。</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">独立数据路由器</h3>
-  <p>文件被分割成多个片段后，会通过独立运营商运营的网络路由器进行传输。任何运营商都无法看到文件的实际大小或名称。即使路由器遭到入侵，也只能看到固定大小的加密片段。网络路由器会将文件片段缓存约48小时。</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    阅读 XFTP 协议规范 →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX 文件传输",
-    "dropZone": "将文件拖放到此处",
-    "dropZoneHint": "或",
-    "chooseFile": "选择文件",
-    "maxSizeHint": "最大支持 100 MB - <a href=\"#join-simplex\">SimpleX Chat 应用</a> 支持最大 1 GB 的文件",
-    "encrypting": "加密中……",
-    "uploading": "正在上传…",
-    "cancel": "取消",
-    "fileUploaded": "文件已上传",
-    "copy": "复制",
-    "copied": "已复制！",
-    "share": "分享",
-    "expiryHint": "文件通常可保存 48 小时。",
-    "securityNote1": "您的文件已在浏览器中加密 - 数据路由器永远不会看到文件内容、名称或大小。",
-    "securityNote2": "加密密钥位于链接的哈希片段中——它永远不会发送到任何服务器。",
-    "securityNote3": "为了获得更好的安全性，请使用<a href=\"https://simplex.chat/download\">SimpleX Chat</a>应用程序。",
-    "retry": "重试",
-    "downloading": "正在下载…",
-    "decrypting": "正在解密…",
-    "downloadComplete": "下载完成",
-    "download": "下载",
-    "fileTooLarge": "文件过大（%size%）。最大文件大小为 100 MB。<a href=\"#join-simplex\">SimpleX 应用</a> 支持最大 1 GB 的文件。",
-    "fileEmpty": "文件为空。",
-    "invalidLink": "链接无效或已损坏。",
-    "initError": "初始化失败：%error%",
-    "fileAvailable": "文件可用（约 %size%）",
-    "dlSecurityNote1": "此文件已加密——数据路由器永远看不到文件内容、名称或大小。",
-    "dlSecurityNote2": "加密密钥位于链接的哈希片段中——它永远不会发送到任何服务器。",
-    "dlSecurityNote3": "为了获得更好的安全性，请使用<a href=\"https://simplex.chat/download\">SimpleX Chat</a>应用程序。",
-    "workersRequired": "需要 Web Workers — 请更新您的浏览器"
-  }
-</script>
-
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-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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diff --git a/zh_Hant/file/index.html b/zh_Hant/file/index.html
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-            e.target.closest('.nav-link').classList.remove('active');
-        }
-        else{
-            document.querySelectorAll('.nav-link').forEach(el => el.classList.remove('active'))
-            e.target.closest('.nav-link').classList.add('active');
-        }
-    }
-    else if(e.target.closest('.nav-toggle-btn')){
-        if(nav.classList.contains('open')){
-            nav.classList.remove('open');
-            document.getElementById('mobile-header').classList.remove('nav-open');
-            document.documentElement.classList.remove('lock-scroll');
-        }
-        else{
-            document.documentElement.classList.add('lock-scroll');
-            document.getElementById('mobile-header').classList.add('nav-open');
-            nav.classList.add('open');
-        }
-    }
-    else if(e.target.closest('.theme-switch-btn')){
-        themeSwitch();
-    }
-});
-</script>
-
-        <html><head><link rel="stylesheet" href="/file-assets/index.css">
-<style>
-  /* Reset website .card styles that conflict with xftp bundle */
-  #app .card { cursor: default; }
-  #app .card,
-  #app .card > div { transition: unset; height: auto; }
-  #app .card > div > * { opacity: unset; max-height: unset; transform: unset; transition: unset; }
-
-  /* Align xftp bundle with website design */
-  #app { font-family: inherit; color: #3F484B; max-width: 600px; width: 100%; margin: 0 auto; padding: 0; }
-  #app .card { background: transparent; box-shadow: none; padding: 0; border-radius: 0; }
-  #app .card > h1 { display: none; }
-  .dark #app h1 { color: #fff; }
-  #app .drop-zone { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; }
-  #app .drop-zone.drag-over { border-color: #0053D0; background: #DBEEFF; }
-  #app .btn { background: #0053D0; border-radius: 34px; padding: 12px 32px; font-size: .9rem; font-weight: 600; }
-  #app .btn:hover { background: #1661D1; }
-  #app .btn-secondary { background: #6b7280; border-radius: 34px; }
-  #app .hint { color: #6b7280; }
-  #app .link-row input { border-radius: 8px; border-color: #c5d3de; }
-  #app .security-note { background: #ffffff; border-radius: 12px; color: #3F484B; }
-  #app .security-note a { color: #0197FF; }
-  #app .success { color: #0053D0; }
-
-  .dark #app { color: #e5e7eb; }
-  .dark #app .card { background: transparent; box-shadow: none; }
-  .dark #app .drop-zone { border-color: #374151; }
-  .dark #app .drop-zone.drag-over { border-color: #70F0F9; background: #1B325C; }
-  .dark #app .btn { background: #70F0F9; color: #000832; }
-  .dark #app .btn:hover { background: #66D9E2; }
-  .dark #app .link-row input { border-color: #374151; background: #071C46; color: #e5e7eb; }
-  .dark #app .security-note { background: #0B2A59; color: #d1d5db; }
-  .dark #app .security-note a { color: #70F0F9; }
-  .dark #app .success { color: #70F0F9; }
-
-  #app #upload-error { border: 2px dashed #c5d3de; border-radius: 12px; padding: 40px 24px; text-align: center; }
-  .dark #app #upload-error { border-color: #374151; }
-
-  #app .stage > .btn { margin-top: 20px; }
-  #app .security-note { margin-top: 20px; }
-  #app .drop-zone .btn { margin: 10px 0 16px; }
-
-  /* Protocol overlay: image fixed, text scrolls natively */
-  /* Push popup below navbar at all widths */
-  #xftp-protocol { padding-top: 70px; }
-  #xftp-protocol .overlay-card {
-    display: flex;
-    flex-direction: column;
-    position: relative;
-    overflow: hidden;
-  }
-  @media (min-width: 768px) {
-    #xftp-protocol .overlay-card { max-height: min(660px, 100%); }
-  }
-  #xftp-protocol .overlay-card > h1 {
-    flex-shrink: 0;
-    padding-bottom: 16px;
-    margin-bottom: 0;
-    z-index: 1;
-  }
-  @media (min-width: 1024px) and (max-height: 750px) {
-    #xftp-protocol .overlay-card > h1 {
-      font-size: 22px;
-    }
-  }
-  /* .flex is the full-width scroll container */
-  #xftp-protocol .overlay-card > .flex {
-    flex: 1;
-    min-height: 0;
-    overflow-y: auto;
-    scrollbar-width: thin;
-    scrollbar-color: #c5d3de transparent;
-  }
-  .dark #xftp-protocol .overlay-card > .flex {
-    scrollbar-color: #374151 transparent;
-  }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar { width: 6px; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-track { background: transparent; }
-  #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #c5d3de; border-radius: 3px; }
-  .dark #xftp-protocol .overlay-card > .flex::-webkit-scrollbar-thumb { background: #374151; }
-  /* Desktop: text stays left, image fixed on right */
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card > .flex > div:first-child {
-      max-width: 50%;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child {
-      position: absolute;
-      right: 56px;
-      top: 0;
-      bottom: 0;
-      left: 55%;
-      display: flex;
-      align-items: center;
-      justify-content: center;
-      pointer-events: none;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child > div {
-      height: 100%;
-      padding: 40px 0;
-      box-sizing: border-box;
-    }
-    #xftp-protocol .overlay-card > .flex > div:last-child img {
-      height: 100%;
-    }
-  }
-  #xftp-protocol .close-overlay-btn {
-    position: absolute;
-    top: 24px;
-    right: 24px;
-    cursor: pointer;
-    z-index: 3;
-    fill: #606C71;
-  }
-  .dark #xftp-protocol .close-overlay-btn { fill: #e5e7eb; }
-  /* Scroll fade: gradient over text area only, hidden at bottom */
-  #xftp-protocol .overlay-card::after {
-    content: '';
-    position: absolute;
-    bottom: 40px;
-    left: 24px;
-    right: 24px;
-    height: 48px;
-    background: linear-gradient(rgba(255,255,255,0), #fff);
-    pointer-events: none;
-    z-index: 2;
-    transition: opacity 0.2s;
-  }
-  .dark #xftp-protocol .overlay-card::after {
-    background: linear-gradient(rgba(7,28,70,0), #071C46);
-  }
-  @media (min-width: 640px) {
-    #xftp-protocol .overlay-card::after { bottom: 56px; left: 56px; right: 56px; }
-  }
-  @media (min-width: 1024px) and (min-height: 600px) {
-    #xftp-protocol .overlay-card::after { right: 50%; }
-  }
-  #xftp-protocol.scrolled-bottom .overlay-card::after { opacity: 0; }
-  #xftp-protocol .overlay-card.flex,
-  #xftp-protocol.flex .overlay-card { animation: overlaySlideIn 0.25s ease-out; }
-  @keyframes overlaySlideIn {
-    from { opacity: 0; transform: scale(0.95) translateY(10px); }
-    to { opacity: 1; transform: scale(1) translateY(0); }
-  }
-  #xftp-protocol.overlay-closing { animation: overlayFadeOut 0.2s ease-in forwards; }
-  #xftp-protocol.overlay-closing .overlay-card { animation: overlaySlideOut 0.2s ease-in forwards; }
-  @keyframes overlayFadeOut {
-    from { opacity: 1; }
-    to { opacity: 0; }
-  }
-  @keyframes overlaySlideOut {
-    from { opacity: 1; transform: scale(1) translateY(0); }
-    to { opacity: 0; transform: scale(0.95) translateY(10px); }
-  }
-
-  .file-proto-link {
-    font-size: 1.25rem;
-    font-weight: 600;
-    background: linear-gradient(90deg, #001aa7 0%, #0095e7 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-    text-decoration: none;
-  }
-  .dark .file-proto-link {
-    background: linear-gradient(90deg, #019bfe 0%, #64fdff 58%, #c8feff 100%);
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
-    background-clip: text;
-  }
-
-</style>
-
-</head><body><section class="bg-secondary-bg-light dark:bg-primary-bg-dark py-10 mt-[66px] px-5">
-  <div class="container flex flex-col items-center mx-auto">
-    <noscript>
-      <p class="text-center text-grey-black dark:text-white py-10">
-        JavaScript is required for file transfer.
-      </p>
-    </noscript>
-    <h1 class="text-[38px] text-center font-bold text-active-blue mb-8">SimpleX File Transfer</h1>
-    <div id="app" data-xftp-app="" data-no-hashchange="" class="w-full">
-      <div class="card">
-        <div class="drop-zone">
-          <p>Drag &amp; drop a file here</p>
-          <p class="hint">or</p>
-          <span class="btn">Choose file</span>
-          <p class="hint">Max 100 MB - <a href="/downloads">SimpleX Chat app</a> supports files up to 1 GB</p>
-        </div>
-      </div>
-    </div>
-    <template id="dl-placeholder">
-      <div class="card">
-        <h1>SimpleX File Transfer</h1>
-        <div class="stage">
-          <p>File available</p>
-          <button class="btn">Download</button>
-          <div class="security-note">
-            <p>This file is encrypted - data routers never see file contents, name or size.</p>
-            <p>The encryption key is in the link’s hash fragment - it is never sent to any server.</p>
-            <p>For better security, use <a href="https://simplex.chat/downloads">SimpleX Chat</a> app.</p>
-          </div>
-        </div>
-      </div>
-    </template>
-    <script>if(location.hash.length>50){var a=document.getElementById("app"),t=document.getElementById("dl-placeholder");if(a&&t)a.replaceChildren(t.content.cloneNode(true))}</script>
-    <script type="module" src="/file-assets/index.js"></script>
-
-    <p class="text-base text-center text-grey-black dark:text-white mt-10 max-w-[600px]">Send files securely with <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span> — no accounts, no tracking.</p>
-    <a href="javascript:void(0)" data-show-overlay="xftp-protocol" class="open-overlay-btn file-proto-link mt-3 block text-center">Learn more about XFTP protocol</a>
-  </div>
-</section>
-
-<section class="bg-primary-bg-light dark:bg-secondary-bg-dark py-[90px] px-5">
-  <div class="container flex flex-col items-center mx-auto text-center">
-    <h2 class="text-[35px] leading-[45px] md:text-[45px] md:leading-[55px] text-grey-black dark:text-white font-bold mb-5">
-      Get SimpleX Chat — the most secure &amp; private messenger
-    </h2>
-    <p class="text-base text-grey-black dark:text-white mb-14 max-w-[600px]">
-      The file transfer you just used uses the same data routing protocol as SimpleX Chat. The app has end-to-end encrypted messaging, voice and video calls, groups, and sending files. No account. No phone. No email. No user profile IDs.
-    </p>
-    <div class="flex items-center justify-center gap-4 flex-wrap">
-      <a href="https://apps.apple.com/us/app/simplex-chat/id1605771084" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apple_store.svg"></a>
-      <a href="https://play.google.com/store/apps/details?id=chat.simplex.app" target="_blank"><img class="h-[40px] w-auto" src="/img/new/google_play.svg"></a>
-      <a href="/zh_Hant/fdroid"><img class="h-[40px] w-auto" src="/img/new/f_droid.svg"></a>
-      <a href="https://testflight.apple.com/join/DWuT2LQu" target="_blank"><img class="h-[40px] w-auto" src="/img/new/testflight.png"></a>
-      <a href="https://github.com/simplex-chat/simplex-chat/releases/latest/download/simplex-aarch64.apk" target="_blank"><img class="h-[40px] w-auto" src="/img/new/apk_icon.png"></a>
-    </div>
-  </div>
-</section>
-
-
-  
-    
-    <div id="xftp-protocol" data-scroll-to="" class="overlay hidden fixed top-0 left-0 bottom-0 right-0 before:absolute before:w-full before:h-full bg-transparent before:bg-secondary-bg-light dark:before:bg-primary-bg-dark before:opacity-90 items-center justify-center p-3 md:p-10 z-[10000]">
-        <div class="overlay-card w-full md:w-fit md:max-w-[1276px] bg-white dark:bg-card-bg-dark opacity-100 h-full md:h-fit md:max-h-[660px] z-[10001] rounded-md shadow-[0px_3px_12px_rgba(0,0,0,0.2)] p-6 py-10 sm:p-14 overflow-auto scale-100">
-            <h1 class="text-3xl font-bold text-active-blue mb-6 ">XFTP protocol: the most secure file transfer</h1>
-            <div class="flex flex-col-reverse lg:flex-row gap-10 justify-between">
-                
-                    <div class="lg:max-w-[448px]">
-                        <div class="text-grey-black dark:text-white flex flex-col gap-6 text-base">
-                            <div>
-  <h3 class="font-bold text-lg mb-2">No account required</h3>
-  <p>Each file fragment uses a new random key. Data routers have no "users" or "files" - they transfer encrypted file fragments of fixed sizes.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Triple-encrypted in your browser</h3>
-  <p>File encryption key is present only in the URL hash fragment - your browser never sends it to a server. There are 3 encryption layers: TLS transport, per-recipient encryption (unique ephemeral key per transfer), and file <span data-glossary="tooltip-end-to-end-encryption" class="glossary-term">end-to-end encryption</span>.</p>
-</div>
-<div>
-  <h3 class="font-bold text-lg mb-2">Independent data routers</h3>
-  <p>When file is split to fragments, it is sent via network routers operated by independent parties. No operator can see the actual file size or name. Even if a router is compromised, it can only see encrypted fragments of fixed size. File fragments are cached by network routers for approximately 48 hours.</p>
-</div>
-<p class="mt-4">
-  <a href="https://github.com/simplex-chat/simplexmq/blob/stable/protocol/xftp.md" target="_blank" rel="noopener" class="text-active-blue hover:underline">
-    Read the XFTP protocol specification →
-  </a>
-</p>
-
-                        </div>
-                    </div>
-                
-
-                
-                    <div class="max-w-[448px]">
-                        <div class="flex items-center justify-center">
-                            <img class="w-full max-w-[448px] min-w-[300px] dark:hidden" src="/img/new/xftp-protocol.svg" alt="">
-                            <img class="w-full max-w-[448px] min-w-[300px] hidden dark:block" src="/img/new/xftp-protocol-dark.svg" alt="">
-                        </div>
-                    </div>
-                
-            </div>
-
-            <svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg">
-                <path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.839522 -0.070157 0.427909 -0.059127 0.18094 0.207531C-0.0660305 0.474191 -0.0552645 0.895911 0.205003 1.14894L5.70862 6.49833L0.20247 11.851C-0.0577975 12.104 -0.0685635 12.5257 0.178407 12.7924C0.306324 12.9306 0.477936 13 0.650181 13C0.811033 13 0.971873 12.9397 1.09726 12.817L6.65343 7.41639L11.9025 12.5186C12.0285 12.6406 12.1893 12.7015 12.3495 12.7015C12.5218 12.7015 12.6934 12.6321 12.8213 12.4939C13.0689 12.2273 13.0582 11.8062 12.7973 11.5525Z"></path>
-            </svg>
-        </div>
-    </div>
-
-
-
-<script>
-  window.__XFTP_I18N__ = {
-    "title": "SimpleX File Transfer",
-    "dropZone": "Drag & drop a file here",
-    "dropZoneHint": "or",
-    "chooseFile": "Choose file",
-    "maxSizeHint": "Max 100 MB - <a href=\"/downloads\">SimpleX Chat app</a> supports files up to 1 GB",
-    "encrypting": "Encrypting…",
-    "uploading": "Uploading…",
-    "cancel": "Cancel",
-    "fileUploaded": "File uploaded",
-    "copy": "Copy",
-    "copied": "Copied!",
-    "share": "Share",
-    "expiryHint": "Files are typically available for 48 hours.",
-    "securityNote1": "Your file was encrypted in the browser - data routers never see file contents, name or size.",
-    "securityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "securityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "retry": "Retry",
-    "downloading": "Downloading…",
-    "decrypting": "Decrypting…",
-    "downloadComplete": "Download complete",
-    "download": "Download",
-    "fileTooLarge": "File too large (%size%). Maximum is 100 MB. The <a href=\"#join-simplex\">SimpleX app</a> supports files up to 1 GB.",
-    "fileEmpty": "File is empty.",
-    "invalidLink": "Invalid or corrupted link.",
-    "initError": "Failed to initialize: %error%",
-    "fileAvailable": "File available (~%size%)",
-    "dlSecurityNote1": "This file is encrypted - data routers never see file contents, name or size.",
-    "dlSecurityNote2": "The encryption key is in the link’s hash fragment - it is never sent to any server.",
-    "dlSecurityNote3": "For better security, use <a href=\"https://simplex.chat/downloads\">SimpleX Chat</a> app.",
-    "workersRequired": "Web Workers required — update your browser"
-  }
-</script>
-
-<script>
-  // Intercept close for #xftp-protocol to add fade-out animation
-  document.getElementById('xftp-protocol')?.addEventListener('click', function(e) {
-    if (e.target.closest('.close-overlay-btn') || (e.target.closest('.overlay') && !e.target.closest('.overlay-card'))) {
-      e.stopPropagation();
-      var el = document.getElementById('xftp-protocol');
-      el.classList.add('overlay-closing');
-      el.addEventListener('animationend', function handler() {
-        el.removeEventListener('animationend', handler);
-        el.classList.remove('flex', 'overlay-closing');
-        el.classList.add('hidden');
-        document.body.classList.remove('lock-scroll');
-        history.replaceState(null, null, ' ');
-      });
-    }
-  }, true);
-
-  // Hide scroll fade gradient when text bottom is visible (works with column-reverse)
-  var scrollArea = document.querySelector('#xftp-protocol .overlay-card > .flex');
-  if (scrollArea) {
-    var textCol = scrollArea.querySelector(':scope > div:first-child > div');
-    function checkScrollBottom() {
-      if (!textCol) return;
-      var scrollRect = scrollArea.getBoundingClientRect();
-      if (scrollRect.height === 0) return; // not laid out yet
-      var textBottom = textCol.getBoundingClientRect().bottom;
-      document.getElementById('xftp-protocol').classList.toggle('scrolled-bottom', textBottom <= scrollRect.bottom + 10);
-    }
-    scrollArea.addEventListener('scroll', checkScrollBottom);
-    new MutationObserver(function() {
-      if (!document.getElementById('xftp-protocol').classList.contains('hidden')) {
-        requestAnimationFrame(checkScrollBottom);
-      }
-    }).observe(document.getElementById('xftp-protocol'), { attributes: true, attributeFilter: ['class'] });
-  }
-</script>
-
-<div id="address-portability" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Address portability</h1><div class="overlay-content"><p>Similarly to <a href="https://en.wikipedia.org/wiki/Local_number_portability">phone number portability</a> (the ability of the customer to transfer the service to another provider without changing the number), the address portability means the ability of a communication service customer to change the service provider without changing the service address. Many <a href="#federated-network">federated networks</a> support SRV records to provide address portability, but allowing service users to set up their own domains for the addresses is not as commonly supported by the available server and client software as for email.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="federated-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Federated network</h1><div class="overlay-content"><p>Federated network is provided by several entities that agree upon the standards and operate the network collectively. This allows the users to choose their provider, that will hold their account, their messaging history and contacts, and communicate with other providers' servers on behalf of the user. The examples are email, XMPP, Matrix and Mastodon.</p><p>The advantage of that design is that there is no single organization that all users depend on, and the standards are more difficult to change, unless it benefits all users. There are several disadvantages: 1) the innovation is slower, 2) each user account still depends on a single organization, and in most cases can't move to another provider without changing their network address – there is no <a href="#address-portability">address portability</a>, 3) the security and privacy are inevitably worse than with the centralized networks.</p><p><a href="https://en.wikipedia.org/wiki/Federation_(information_technology)">Federation on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="anonymous-credentials" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Anonymous credentials</h1><div class="overlay-content"><p>The credential that allows proving something, e.g. the right to access some resource, without identifying the user. This credential can either be generated by a trusted party or by the user themselves and provided together with the request to create the resource. The first approach creates some centralized dependency in most cases. The second approach does not require any trust - this is used in SimpleX network to authorize access to the messaging queues.</p><p><a href="https://en.wikipedia.org/wiki/Digital_credential">Digital credential on Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="blockchain" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Blockchain</h1><div class="overlay-content"><p>In a wide sense, blockchain means a sequence of blocks of data, where each block contains a cryptographic hash of the previous block, thus providing integrity to the whole chain. Blockchains are used in many communication and information storage systems to provide integrity and immutability of the data. For example, BluRay disks use blockchain. SimpleX messaging queues also use blockchain - each message includes the hash of the previous message, to ensure the integrity – if any message is modified it will be detected by the recipient when the next message is received. Blockchains are a subset of <a href="#merkle-directed-acyclic-graph">Merkle directed acyclic graphs</a>.</p><p>In a more narrow sense, particularly in media, blockchain is used to refer specifically to distributed ledger, where each record also includes the hash of the previous record, but the blocks have to be agreed by the participating peers using some <a href="https://en.wikipedia.org/wiki/Consensus_(computer_science)">consensus protocol</a>.</p><p><a href="https://en.wikipedia.org/wiki/Blockchain">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="merkle-directed-acyclic-graph" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Merkle directed acyclic graph</h1><div class="overlay-content"><p>Also known as Merkle DAG, a data structure based on a general graph structure where node contains the cryptographic hashes of the previous nodes that point to it. Merkle trees are a subset of Merkle DAGs - in this case each leaf contains a cryptographic hash of the parent.</p><p>This structure by design allows to verify the integrity of the whole structure by computing its hashes and comparing with the hashes included in the nodes, in the same way as with <a href="#blockchain">blockchain</a>.</p><p>The motivation to use DAG in distributed environments instead of a simpler linear blockchain is to allow concurrent additions, when there is no requirement for a single order of added items. Merkle DAG is used, for example, in <a href="https://en.wikipedia.org/wiki/InterPlanetary_File_System">IPFS</a> and will be used in decentralized SimpleX groups.</p><p><a href="https://en.wikipedia.org/wiki/Merkle_tree">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="break-in-recovery" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Break-in recovery</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="double-ratchet-algorithm" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Double ratchet algorithm</h1><div class="overlay-content"><p>It is used by two parties to exchange <a href="#end-to-end-encryption">end-to-end encrypted</a> messages. The parties will use some <a href="#key-agreement-protocol">key agreement protocol</a> to agree on the initial shared secret key.</p><p>Double Ratchet algorithm provides <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>. It is <a href="https://signal.org/docs/specifications/doubleratchet">designed by Signal</a>, and used in SimpleX Chat and many other secure messengers. Most experts consider it the state-of-the-art encryption protocol in message encryption.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="centralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Centralized network</h1><div class="overlay-content"><p>Centralized networks are provided or controlled by a single entity. The examples are Threema, Signal, WhatsApp and Telegram. The advantage of that design is that the provider can innovate faster, and has a centralized approach to security. But the disadvantage is that the provider can change or discontinue the service, and leak, sell or disclose in some other way all users' data, including who they are connected with.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="content-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Content padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="decentralized-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Decentralized network</h1><div class="overlay-content"><p>Decentralized network is often used to mean "the network based on decentralized blockchain". In its original meaning, decentralized network means that there is no central authority or any other point of centralization in the network, other than network protocols specification. The advantage of decentralized networks is that they are resilient to censorship and to the provider going out of business. The disadvantage is that they are often slower to innovate, and the security may be worse than with the centralized network.</p><p>The examples of decentralized networks are email, web, DNS, XMPP, Matrix, BitTorrent, etc. All these examples have a shared global application-level address space. Cryptocurrency blockchains not only have a shared address space, but also a shared state, so they are more centralized than email. Tor network also has a shared global address space, but also a central authority. SimpleX network does not have a shared application-level address space (it relies on the shared transport-level addresses - SMP relay hostnames or IP addresses), and it does not have any central authority or any shared state.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="defense-in-depth" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Defense in depth</h1><div class="overlay-content"><p>Originally, it is a military strategy that seeks to delay rather than prevent the advance of an attacker, buying time and causing additional casualties by yielding space.</p><p>In information security, defense in depth represents the use of multiple computer security techniques to help mitigate the risk of one component of the defense being compromised or circumvented. An example could be anti-virus software installed on individual workstations when there is already virus protection on the firewalls and servers within the same environment.</p><p>SimpleX network applies defense in depth approach to security by having multiple layers for the communication security and privacy:</p><ul>
-<li>double ratchet algorithm for <a href="#end-to-end-encryption">end-to-end encryption</a> with <a href="#forward-secrecy">perfect forward secrecy</a> and <a href="#post-compromise-security">post-compromise security</a>,</li>
-<li>additional layer of end-to-end encryption for each messaging queue and another encryption layer of encryption from the server to the recipient inside TLS to prevent correlation by ciphertext,</li>
-<li>TLS with only strong ciphers allowed,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-server connection via server offline certificate verification,</li>
-<li>mitigation of replay attacks via signing over transport channel binding,</li>
-<li>multiple layers of <a href="#message-padding">message padding</a> to reduce efficiency of traffic analysis,</li>
-<li>mitigation of <a href="#man-in-the-middle-attack">man-in-the-middle attack</a> on client-client out-of-band channel when sending the invitation,</li>
-<li>rotation of delivery queues to reduce efficiency of traffic analysis,</li>
-<li>etc.</li>
-</ul><p><a href="https://en.wikipedia.org/wiki/Defence_in_depth">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="end-to-end-encryption" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">End-to-end encryption</h1><div class="overlay-content"><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><p>End-to-end encryption requires agreeing cryptographic keys between the sender and the recipient in a way that no eavesdroppers can access the agreed keys. See <a href="#key-agreement-protocol">key agreement protocol</a>. This key exchange can be compromised via <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>, particularly if key exchange happens via the same communication provider and no out-of-band channel is used to verify key exchange.</p><p><a href="https://en.wikipedia.org/wiki/End-to-end_encryption">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-compromise-security" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-compromise security</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="man-in-the-middle-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Man-in-the-middle attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="message-padding" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Message padding</h1><div class="overlay-content"><p>Also known as content padding, it is the process of adding data to the beginning or the end of a message prior to encryption. Padding conceals the actual message size from any eavesdroppers. SimpleX has several encryption layers, and prior to each encryption the content is padded to a fixed size.</p><p><a href="https://en.wikipedia.org/wiki/Padding_(cryptography)">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="key-agreement-protocol" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key agreement protocol</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="tooltip-end-to-end-encryption" class="glossary-tooltip"><div class="tooltip-content"><h4 class="tooltip-title">End-to-end encryption</h4><p>A communication system where only the communicating parties can read the messages. It is designed to protect message content from any potential eavesdroppers – telecom and Internet providers, malicious actors, and also the provider of the communication service.</p><button class="read-more-btn open-overlay-btn" data-show-overlay="end-to-end-encryption">Read more</button></div></div><div id="key-exchange" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Key exchange</h1><div class="overlay-content"><p>Also known as key exchange, it is a process of agreeing cryptographic keys between the sender and the recipient(s) of the message. It is required for <a href="#end-to-end-encryption">end-to-end encryption</a> to work. Unless it is possible to secure the key exchange via <a href="#2-factor-key-exchange">some second factor</a>, e.g. security code verification, it can be vulnerable to <a href="#man-in-the-middle-attack">man-in-the-middle attack</a>.</p><p><a href="https://en.wikipedia.org/wiki/Key-agreement_protocol">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="mitm-attack" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">MITM attack</h1><div class="overlay-content"><p>The attack when the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</p><p>This attack can be used to compromise <a href="#end-to-end-encryption">end-to-end encryption</a> by intercepting public keys during <a href="#key-agreement-protocol">key exchange</a>, substituting them with the attacker's keys, and then intercepting and re-encrypting all messages, without altering their content. With this attack, while the attacker does not change message content, but she can read the messages, while the communicating parties believe the messages are end-to-end encrypted.</p><p>Such attack is possible with any system that uses the same channel for key exchange as used to send messages - it includes almost all communication systems except SimpleX, where the initial public key is always passed out-of-band. Even with SimpleX, the attacker may intercept and substitute the key sent via another channel, gaining access to communication. This risk is substantially lower, as attacker does not know in advance which channel will be used to pass the key.</p><p>To mitigate such attack the communicating parties must verify the integrity of key exchange - SimpleX and many other messaging apps, e.g. Signal and WhatsApp, have the feature that allows it.</p><p><a href="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="non-repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Non-repudiation</h1><div class="overlay-content">Non-repudiation</div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="onion-routing" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Onion routing</h1><div class="overlay-content"><p>A technique for anonymous communication over a computer network that uses multiple layers of message encryption, analogous to the layers of an onion. The encrypted data is transmitted through a series of network nodes called "onion routers," each of which "peels" away a single layer, revealing the data's next destination. The sender remains anonymous because each intermediary knows only the location of the immediately preceding and following nodes.</p><p>The most widely used onion network is <a href="https://en.wikipedia.org/wiki/Tor_(network)">Tor</a>.</p><p>Some elements of SimpleX network use similar ideas in their design - different addresses for the same resource used by different parties, and additional encryption layers. Currently though, SimpleX messaging protocol does not protect sender network address, as the relay server is chosen by the recipient. The delivery relays chosen by sender that are planned for the future would make SimpleX design closer to onion routing.</p><p><a href="https://en.wikipedia.org/wiki/Onion_routing">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="overlay-network" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Overlay network</h1><div class="overlay-content"><p>Nodes in the overlay network can be thought of as being connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. Tor, for example, is an overlay network on top of IP network, which in its turn is also an overlay network over some underlying physical network.</p><p>SimpleX Clients also form a network using SMP relays and IP or some other overlay network (e.g., Tor), to communicate with each other. SMP relays, on another hand, do not form a network.</p><p><a href="https://en.wikipedia.org/wiki/Overlay_network">Wikipedia</a></p><h1>Non-repudiation</h1><p>The property of the cryptographic or communication system that allows the recipient of the message to prove to any third party that the sender identified by some cryptographic key sent the message. It is the opposite to <a href="#repudiation">repudiation</a>. While in some context non-repudiation may be desirable (e.g., for contractually binding messages), in the context of private communications it may be undesirable.</p><p><a href="https://en.wikipedia.org/wiki/Non-repudiation">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="repudiation" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Repudiation</h1><div class="overlay-content"><p>The property of the cryptographic or communication system that allows the sender of the message to plausibly deny having sent the message, because while the recipient can verify that the message was sent by the sender, they cannot prove it to any third party - the recipient has a technical ability to forge the same encrypted message. This is an important quality of private communications, as it allows to have the conversation that can later be denied, similarly to having a private face-to-face conversation.</p><p>See also <a href="#non-repudiation">non-repudiation</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="pairwise-pseudonymous-identifier" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Pairwise pseudonymous identifier</h1><div class="overlay-content"><p>Generalizing <a href="https://csrc.nist.gov/glossary/term/pairwise_pseudonymous_identifier">the definition</a> from NIST Digital Identity Guidelines, it is an opaque unguessable identifier generated by a service used to access a resource by only one party.</p><p>In the context of SimpleX network, these are the identifiers generated by SMP relays to access anonymous messaging queues, with a separate identifier (and access credential) for each accessing party: recipient, sender and and optional notifications subscriber. The same approach is used by XFTP relays to access file chunks, with separate identifiers (and access credentials) for sender and each recipient.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Peer-to-peer</h1><div class="overlay-content"><p>Peer-to-peer (P2P) is the network architecture when participants have equal rights and communicate directly via a general purpose transport or overlay network. Unlike client-server architecture, all peers in a P2P network both provide and consume the resources. In the context of messaging, P2P architecture usually means that the messages are sent between peers, without user accounts or messages being stored on any servers. Examples are Tox, Briar, Cwtch and many others.</p><p>The advantage is that the participants do not depend on any servers. There are <a href="./SIMPLEX.md#comparison-with-p2p9-messaging-protocols">multiple downsides</a> to that architecture, such as no asynchronous message delivery, the need for network-wide peer addresses, possibility of network-wide attacks, that are usually mitigated only by using a centralized authority. These disadvantages are avoided with <a href="#proxied-peer-to-peer">proxied P2P</a> architecture.</p><p><a href="https://en.wikipedia.org/wiki/Peer-to-peer">Wikipedia</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="proxied-peer-to-peer" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Proxied peer-to-peer</h1><div class="overlay-content"><p>Network topology of the communication system when peers communicate via proxies that do not form the network themselves. Such design is used in Pond, that has a fixed home server for each user, and in SimpleX, that uses multiple relays providing temporary connections.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="perfect-forward-secrecy" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Perfect forward secrecy</h1><div class="overlay-content"><p>Also known as perfect forward secrecy, it is a feature of a <a href="#key-agreement-protocol">key agreement protocol</a> that ensures that session keys will not be compromised even if long-term secrets used in the session key exchange are compromised. Forward secrecy protects past sessions against future compromises of session or long-term keys.</p><p><a href="https://en.wikipedia.org/wiki/Forward_secrecy">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-cryptography" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum cryptography</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="post-quantum-hybrid-crypto" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Post-quantum hybrid crypto</h1><div class="overlay-content"><p>Any of the proposed cryptographic systems or algorithms that are thought to be secure against an attack by a quantum computer. It appears that as of 2025 there is no system or algorithm that is <em>proven</em> to be secure against such attacks, or even to be secure against attacks by massively parallel conventional computers, so a general recommendation is to use post-quantum hybrid cryptography - combining post-quantum and traditional algorigthms.</p><p><a href="https://en.wikipedia.org/wiki/Post-quantum_cryptography">Wikipedia</a></p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="recovery-from-compromise" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">Recovery from compromise</h1><div class="overlay-content"><p>The quality of the end-to-end encryption scheme allowing to recover security against a passive attacker who observes encrypted messages after compromising one (or both) of the parties. Also known as recovery from compromise or break-in recovery. <a href="#double-ratchet-algorithm">Double-ratchet algorithm</a> has this quality.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div><div id="user-identity" class="overlay glossary-overlay hidden"><div class="overlay-card"><h1 class="overlay-title">User identity</h1><div class="overlay-content"><p>In a communication system it refers to anything that uniquely identifies the users to the network. Depending on the communication network, it can be a phone number, email address, username, public key or a random opaque identifier. Most messaging networks rely on some form of user identity. SimpleX appears to be the only messaging network that does not rely on any kind of user identity - see <a href="https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols">this comparison</a>.</p></div><svg class="close-overlay-btn" id="cross" width="16" height="16" viewBox="0 0 13 13" xmlns="http://www.w3.org/2000/svg"><path d="M12.7973 11.5525L7.59762 6.49833L12.7947 1.44675C13.055 1.19371 13.0658 0.771991 12.8188 0.505331C12.5718 0.238674 12.1602 0.227644 11.8999 0.480681L6.65343 5.58028L1.09979 0.182228C0.805 0.002228 0.430001 0.002228 0.135211 0.182228C-0.159579 0.362228 -0.159579 0.697228 0.135211 0.877228L5.68885 6.27528L0.4918 11.3295C0.231501 11.5825 0.220703 12.0042 0.467664 12.2709C0.714625 12.5376 1.12625 12.5486 1.38655 12.2956L6.63302 7.196L12.1867 12.5941C12.4815 12.7741 12.8565 12.7741 13.1513 12.5941C13.4461 12.4141 13.4461 12.0791 13.1513 11.8991L12.7973 11.5525Z"></path></svg></div></div></body></html>
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