I mean, Signal's encryption is literally based of OTR's which was popular on XMPP for like a decade before Signal came around, OMEMO further added ratcheting which allows for one party to be offline when starting the convo.
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I mean, Signal's encryption is literally based of OTR's which was popular on XMPP for like a decade before Signal came around, OMEMO further added ratcheting which allows for one party to be offline when starting the convo.