@tris there are three actively developed protocols for federated instant messaging (XMPP, Matrix, Deltachat). At least one of them is very open to new developers and new ideas and has a structure in place to collaboratively work on those ideas and bring various stake holders together. With no disrespect to that individual I don't see why there needs to be a forth protocol loosely based on ActivityPub.
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@daniel I think the idea is to bring E2EE DM in Fediverse. X did bring E2EE in X chat (spoiler: it was disastrous, see: https://blog.cryptographyengineering.com/2025/06/09/a-bit-more-on-twitter-xs-new-encrypted-messaging/). IIRC, @filippo was working on E2EE chat on AT proto (Bluesky).
@tris Soatak is an expert in cryptography. I’m not. I’m more than happy to stand on the shoulder of giants when it comes to E2EE. That’s why we used the Signal Protocol 10+ years ago for #OMEMO and are now looking towards #MLS. However, good, interoperable protocol design is so much more than just E2EE. And maybe I've learned a thing or two about protocol design in my career that they don’t necessarily know.