@alex the problem with pgp is that it also proves that _you_ wrote something in case the key leaks, as everything is the same keypair. that's what double ratchet improves - forward security. what you actually need depends on the threat model of course, pgp isn't bad.
@Hyolobrika @bonifartius @alex That assumes the sender signed the msg. If Bob encrypts a msg to Alice & does not sign it, and he also does not encrypt to self (some ppl do this to store a copy), then the only thing tying Bob to that msg is whatever metadata accompanies the payload. Alex doesn’t mention the protocol involved. If we’re talking XMPP, then openpgp is an issue b/c some clients only have OMEMO.
@koherecoWatchdog i'd say that "encrypted with private key" is a signature.
@Hyolobrika@mstdn.io @alex
@koherecoWatchdog
ah, indeed, had a brain fart :)
@alex @Hyolobrika@mstdn.io