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> a non-web client that does E2EE

Yeah, I guess secure scuttlebutt comes to mind? But it's kinda it's own thing, notably with it's own scaling issues when it comes to widespread use.

Does mastodon even support E2EE? If you want encrypted chat rooms, isn't that what Matrix is for

The server has the bits to do it [1], but clients need to implement it (they are the "ends" in "end-to-end encryption" after all). However this hasn't seen much interest from app developers and users.

[1]: https://github.com/mastodon/mastodon/pull/13820

> non-web client that does E2EE

Signal?

Signal has a web client? Link please.

Signal is a non-web app, but not (afaik?) a client for Mastodon.