&gt; Why are all these encrypted chat programs (Signal, Telegram, &amp;c.) still centralized and not TOR-style onion-routed?<p><a href="https:&#x2F;&#x2F;blog.torproject.org&#x2F;blog&#x2F;tor-messenger-beta-chat-over-tor-easily" rel="nofollow">https:&#x2F;&#x2F;blog.torproject.org&#x2F;blog&#x2F;tor-messenger-beta-chat-ove...</a><p>&gt; Tor Messenger builds on the networks you are familiar with, so that you can continue communicating in a way your contacts are willing and able to do. This has traditionally been in a client-server model, meaning that your metadata (specifically the relationships between contacts) can be logged by the server. However, your route to the server will be hidden because you are communicating over Tor.<p>That is essentially what happens with Signal and every other service as well.<p>No metadata, truly anonymous communication between trusted parties is an unsolved research problem.