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Extensible Messaging and Presence Protocol is a communications protocol for message-oriented middleware based on XML.

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1 answer
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How do end-to-end encrypted chat services ensure that the server admin doesn't add new membe...

This question is about any chat service that supports end-to-end encrypted group chats, for instance Signal, XMPP + OMEMO (closed group chats in particular), WhatsApp, and the like. …
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