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blog/20240314-simplex-chat-v5-6-quantum-resistance-signal-double-ratchet-algorithm.html
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<p><sup>2</sup> Post-quantum cryptography is available in beta version, as opt-in only for direct conversations. See below how it will be rolled-out further.</p>
<p>Some columns are marked with a yellow checkmark:</p>
<ul>
<li>when messages are padded, but not to a fixed size.</li>
<li>when messages are padded, but not to a fixed size (Briar pads messages to the size rounded up to 1024 bytes, Signal - to 160 bytes).</li>
<li>when repudiation does not include client-server connection. In case of Cwtch it appears that the presence of cryptographic signatures compromises repudiation (deniability), but it needs to be clarified.</li>
<li>when 2-factor key exchange is optional (via security code verification).</li>
<li>when post-quantum cryptography is only added to the initial key agreement and does not protect break-in recovery.</li>
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&lt;p&gt;&lt;sup&gt;2&lt;/sup&gt; Post-quantum cryptography is available in beta version, as opt-in only for direct conversations. See below how it will be rolled-out further.&lt;/p&gt;
&lt;p&gt;Some columns are marked with a yellow checkmark:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;when messages are padded, but not to a fixed size.&lt;/li&gt;
&lt;li&gt;when messages are padded, but not to a fixed size (Briar pads messages to the size rounded up to 1024 bytes, Signal - to 160 bytes).&lt;/li&gt;
&lt;li&gt;when repudiation does not include client-server connection. In case of Cwtch it appears that the presence of cryptographic signatures compromises repudiation (deniability), but it needs to be clarified.&lt;/li&gt;
&lt;li&gt;when 2-factor key exchange is optional (via security code verification).&lt;/li&gt;
&lt;li&gt;when post-quantum cryptography is only added to the initial key agreement and does not protect break-in recovery.&lt;/li&gt;
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@@ -1228,7 +1228,7 @@ See &lt;a href=&quot;https://simplex.chat/faq/index.html#does-simplex-protect-my
&lt;p&gt;&lt;sup&gt;2&lt;/sup&gt; Post-quantum cryptography is available in beta version, as opt-in only for direct conversations. See below how it will be rolled-out further.&lt;/p&gt;
&lt;p&gt;Some columns are marked with a yellow checkmark:&lt;/p&gt;
&lt;ul&gt;
&lt;li&gt;when messages are padded, but not to a fixed size.&lt;/li&gt;
&lt;li&gt;when messages are padded, but not to a fixed size (Briar pads messages to the size rounded up to 1024 bytes, Signal - to 160 bytes).&lt;/li&gt;
&lt;li&gt;when repudiation does not include client-server connection. In case of Cwtch it appears that the presence of cryptographic signatures compromises repudiation (deniability), but it needs to be clarified.&lt;/li&gt;
&lt;li&gt;when 2-factor key exchange is optional (via security code verification).&lt;/li&gt;
&lt;li&gt;when post-quantum cryptography is only added to the initial key agreement and does not protect break-in recovery.&lt;/li&gt;