diff --git a/diagrams/message.mmd b/diagrams/message.mmd
index 36aae4bd3..548804785 100644
--- a/diagrams/message.mmd
+++ b/diagrams/message.mmd
@@ -6,7 +6,7 @@ sequenceDiagram
   participant App B
   participant Bob
   Alice ->> App A: Alice writes the message to Bob in the app
-  App A ->> Server A: the message (including ID & timestamp) is encrypted by <Alice-Bob public key> and sent to all Alice's servers<br>{from: <Bob-Alice key hash>, to: <Alice-Bob key hash>, message: <encrypted with Alice-Bob public key>}
-  Server A ->> Server B: Alice's servers use <Alice-Bob key hash> to locate Bob's servers<br>and forwards encrypted message to all Bob's servers (in case they are different from Alice's servers
+  App A ->> Server A: The message (including ID & timestamp) is encrypted with <AB public key> and sent to all Alice's servers<br>{from: <BA public key hash>, to: <AB public key hash>, message: <encrypted with AB public key>}
+  Server A ->> Server B: Alice's servers use <AB public key hash> to locate Bob's servers<br>and forward encrypted message to all Bob's servers (when they are different from Alice's servers
   Server B ->> App B: Bob's servers send the message to Bob's app
-  App B ->> Bob: Bob's app uses <Bob-Alice key hash> to identify Alice<br>and decrypts the message with <Bob-Alice private key> to show it
\ No newline at end of file
+  App B ->> Bob: Bob's app uses <BA public key hash> to identify Alice<br>and decrypts the messages with <AB private key>
diff --git a/diagrams/message.svg b/diagrams/message.svg
index 4a1a7668b..01ef078a9 100644
--- a/diagrams/message.svg
+++ b/diagrams/message.svg
@@ -1,49 +1,49 @@
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     font-size: 10px; }
 
-#mermaid-1576937421782 .stateLabel .box {
+#mermaid-1576937798508 .stateLabel .box {
   stroke: none;
   stroke-width: 0;
   fill: #ECECFF;
   opacity: 0.5; }
 
-#mermaid-1576937421782 .stateLabel text {
+#mermaid-1576937798508 .stateLabel text {
   fill: black;
   font-size: 10px;
   font-weight: bold;
@@ -492,7 +492,7 @@
   --mermaid-font-family: '"trebuchet ms", verdana, arial';
   --mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive; }
 
-:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}</style><style>#mermaid-1576937421782 {
+:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}</style><style>#mermaid-1576937798508 {
     color: rgb(0, 0, 0);
     font: normal normal 400 normal 16px / normal "trebuchet ms", verdana, arial;
-  }</style><g></g><g><line id="actor12" x1="75" y1="5" x2="75" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="0" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="75" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="75" dy="0">Alice</tspan></text></g><g><line id="actor13" x1="275" y1="5" x2="275" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="200" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="275" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="275" dy="0">App A</tspan></text></g><g><line id="actor14" x1="475" y1="5" x2="475" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="400" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="475" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="475" dy="0">Server A</tspan></text></g><g><line id="actor15" x1="675" y1="5" x2="675" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="600" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="675" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="675" dy="0">Server B</tspan></text></g><g><line id="actor16" x1="875" y1="5" x2="875" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="800" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="875" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="875" dy="0">App B</tspan></text></g><g><line id="actor17" x1="1075" y1="5" x2="1075" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="1000" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="1075" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="1075" dy="0">Bob</tspan></text></g><defs><marker id="arrowhead" refX="5" refY="2" markerWidth="6" markerHeight="4" orient="auto"><path d="M 0,0 V 4 L6,2 Z"></path></marker></defs><defs><marker id="crosshead" markerWidth="15" markerHeight="8" orient="auto" refX="16" refY="4"><path fill="black" stroke="#000000" stroke-width="1px" d="M 9,2 V 6 L16,4 Z" style="stroke-dasharray: 0, 0;"></path><path fill="none" stroke="#000000" stroke-width="1px" d="M 0,1 L 6,7 M 6,1 L 0,7" style="stroke-dasharray: 0, 0;"></path></marker></defs><defs><marker id="sequencenumber" refX="15" refY="15" markerWidth="60" markerHeight="40" orient="auto"><circle cx="15" cy="15" r="6"></circle></marker></defs><g><text x="175" y="93" class="messageText" style="text-anchor: middle;">Alice writes the message to Bob in the app</text><line x1="75" y1="100" x2="275" y2="100" class="messageLine0" stroke-width="2" stroke="black" marker-end="url(#arrowhead)" style="fill: none;"></line></g><g><text x="375" y="128" class="messageText" style="text-anchor: middle;">The message (including ID &amp; timestamp) is encrypted by &lt;Alice-Bob public key&gt; and sent to all Alice's servers</text><text x="375" y="145" class="messageText" style="text-anchor: middle;">{from: &lt;Bob-Alice key hash&gt;, to: &lt;Alice-Bob key hash&gt;, message: &lt;encrypted with Alice-Bob public key&gt;}</text><line x1="275" y1="135" x2="475" y2="135" class="messageLine0" stroke-width="2" stroke="black" marker-end="url(#arrowhead)" style="fill: none;"></line></g><g><text x="575" y="163" class="messageText" style="text-anchor: middle;">Alice's servers use &lt;Alice-Bob key hash&gt; to locate Bob's servers</text><text x="575" y="180" class="messageText" style="text-anchor: middle;">and forwards encrypted message to all Bob's servers (in case they are different from Alice's servers</text><line x1="475" y1="170" x2="675" y2="170" class="messageLine0" stroke-width="2" stroke="black" marker-end="url(#arrowhead)" style="fill: none;"></line></g><g><text x="775" y="198" class="messageText" style="text-anchor: middle;">Bob's servers send the message to Bob's app</text><line x1="675" y1="205" x2="875" y2="205" class="messageLine0" stroke-width="2" stroke="black" marker-end="url(#arrowhead)" style="fill: none;"></line></g><g><text x="975" y="233" class="messageText" style="text-anchor: middle;">Bob's app uses &lt;Bob-Alice key hash&gt; to identify Alice</text><text x="975" y="250" class="messageText" style="text-anchor: middle;">and decrypts the message with &lt;Bob-Alice private key&gt; to show it</text><line x1="875" y1="240" x2="1075" y2="240" class="messageLine0" stroke-width="2" stroke="black" marker-end="url(#arrowhead)" style="fill: none;"></line></g><g><rect x="0" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="75" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="75" dy="0">Alice</tspan></text></g><g><rect x="200" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="275" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="275" dy="0">App A</tspan></text></g><g><rect x="400" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="475" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="475" dy="0">Server A</tspan></text></g><g><rect x="600" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="675" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="675" dy="0">Server B</tspan></text></g><g><rect x="800" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="875" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="875" dy="0">App B</tspan></text></g><g><rect x="1000" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="1075" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="1075" dy="0">Bob</tspan></text></g></svg>
\ No newline at end of file
+  }</style><g></g><g><line id="actor1476" x1="75" y1="5" x2="75" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="0" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="75" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="75" dy="0">Alice</tspan></text></g><g><line id="actor1477" x1="275" y1="5" x2="275" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="200" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="275" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="275" dy="0">App A</tspan></text></g><g><line id="actor1478" x1="475" y1="5" x2="475" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="400" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="475" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="475" dy="0">Server A</tspan></text></g><g><line id="actor1479" x1="675" y1="5" x2="675" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="600" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="675" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="675" dy="0">Server B</tspan></text></g><g><line id="actor1480" x1="875" y1="5" x2="875" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="800" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="875" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="875" dy="0">App B</tspan></text></g><g><line id="actor1481" x1="1075" y1="5" x2="1075" y2="325" class="actor-line" stroke-width="0.5px" stroke="#999"></line><rect x="1000" y="0" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="1075" y="32.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="1075" dy="0">Bob</tspan></text></g><defs><marker id="arrowhead" refX="5" refY="2" markerWidth="6" markerHeight="4" orient="auto"><path d="M 0,0 V 4 L6,2 Z"></path></marker></defs><defs><marker id="crosshead" markerWidth="15" markerHeight="8" orient="auto" refX="16" refY="4"><path fill="black" stroke="#000000" stroke-width="1px" d="M 9,2 V 6 L16,4 Z" style="stroke-dasharray: 0, 0;"></path><path fill="none" stroke="#000000" stroke-width="1px" d="M 0,1 L 6,7 M 6,1 L 0,7" style="stroke-dasharray: 0, 0;"></path></marker></defs><defs><marker id="sequencenumber" refX="15" refY="15" markerWidth="60" markerHeight="40" orient="auto"><circle cx="15" cy="15" r="6"></circle></marker></defs><g><text x="175" y="93" class="messageText" style="text-anchor: middle;">Alice writes the message to Bob in the app</text><line x1="75" y1="100" x2="275" y2="100" class="messageLine0" stroke-width="2" stroke="black" marker-end="url(#arrowhead)" style="fill: none;"></line></g><g><text x="375" y="128" class="messageText" style="text-anchor: middle;">The message (including ID &amp; 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to identify Alice</text><text x="975" y="250" class="messageText" style="text-anchor: middle;">and decrypts the messages with &lt;AB private key&gt;</text><line x1="875" y1="240" x2="1075" y2="240" class="messageLine0" stroke-width="2" stroke="black" marker-end="url(#arrowhead)" style="fill: none;"></line></g><g><rect x="0" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="75" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="75" dy="0">Alice</tspan></text></g><g><rect x="200" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="275" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; font-size: 14px;"><tspan x="275" dy="0">App A</tspan></text></g><g><rect x="400" y="260" fill="#eaeaea" stroke="#666" width="150" height="65" rx="3" ry="3" class="actor"></rect><text x="475" y="292.5" dominant-baseline="central" alignment-baseline="central" class="actor" style="text-anchor: middle; 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\ No newline at end of file