No, they only have transport encryption with TLS. This is why we recommend Matrix instead. I think Mastodon is working on E2E encryption for ActivityPub, but it seems extremely complicated.
this post was submitted on 31 Oct 2020
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It would be nice to have them, it's an additional attraction factor for users. It could be done using hybrid approach where one hash derived from user password is used to authenticate in Lemmy and retrieve chat list, second completing hash would decrypt them. Example: https://hacks.mozilla.org/2018/11/firefox-sync-privacy/
Implementing E2E isn't just about the encryption though, it's also about the key exchange/distribution/generation approach.
If you look at what Matrix does, so much of the complexity comes from how they authenticate all the different clients to manage E2E in a distributed way. For proper E2E you've got more than 2 ends (multiple clients) so you need to manage it for all.
I don't get what makes it hard to implement the same stuff using libraries provided, encryption should be optional for servers administrators to enable
Encryption is hard to get right. Which doesn't help when it's essentially useless unless you get it right
https://github.com/soatok/mastodon-e2ee-specification was a thing but it doesn't seem to be updated for months now.
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