Federated End-to-End Encrypted Messaging is Coming Soon
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https://wedistribute.org/2026/02/fediverse-e2ee-coming/
Important progress has been made regarding bringing MLS end-to-end encryption to the ActivityPub protocol, with developers already building implementations and providing feedback to a future version of the protocol spec.
PieFed
Sean Tilley
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And XMPP before it, even for e2ee messaging. At least this is a slightly different use case.