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<h1 id="encryption"><a class="header" href="#encryption">Encryption</a></h1>
<section class="warning">
Encryption support is <strong>HIGHLY EXPERIMENTAL AND SUBJECT TO CHANGE</strong>. It should not be enabled for production workloads.
For more details, see <a href="https://github.com/matrix-org/matrix-hookshot/issues/594">issue 594</a>.
</section>
<p>Hookshot supports end-to-bridge encryption via <a href="https://github.com/matrix-org/matrix-spec-proposals/pull/3202">MSC3202</a>. As such, encryption requires hookshot to be connected to a homeserver that supports that MSC, such as <a href="#running-with-synapse">Synapse</a>.</p>
<h2 id="enabling-encryption-in-hookshot"><a class="header" href="#enabling-encryption-in-hookshot">Enabling encryption in Hookshot</a></h2>
<p>In order for hookshot to use encryption, it must be configured as follows:</p>
<ul>
<li>The <code>experimentalEncryption.storagePath</code> setting must point to a directory that hookshot has permissions to write files into. If running with Docker, this path should be within a volume (for persistency).</li>
<li><a href="./workers.html">Redis</a> must be enabled. Note that worker mode is not yet supported with encryption, so <code>queue.monolithic</code> must be set to <code>true</code>.</li>
</ul>
<p>If you ever reset your homeserver's state, ensure you also reset hookshot's encryption state. This includes clearing the <code>encryption.storagePath</code> directory and all worker state stored in your redis instance. Otherwise, hookshot may fail on start up with registration errors.</p>
<p>Also ensure that hookshot's appservice registration file contains every line from <code>registration.sample.yml</code> that appears after the <code>If enabling encryption</code> comment. Note that changing the registration file may require restarting the homeserver that hookshot is connected to.</p>
<h2 id="running-with-synapse"><a class="header" href="#running-with-synapse">Running with Synapse</a></h2>
<p><a href="https://github.com/matrix-org/synapse/">Synapse</a> has functional support for MSC3202 as of <a href="https://github.com/matrix-org/synapse/releases/tag/v1.63.0">v1.63.0</a>. To enable it, add the following section to Synapse's configuration file (typically named <code>homeserver.yaml</code>):</p>
<pre><code class="language-yaml">experimental_features:
msc3202_device_masquerading: true
msc3202_transaction_extensions: true
msc2409_to_device_messages_enabled: true
</code></pre>
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