| http://www.w3.org/ns/prov#value | - The S/MIME approach defined in [RFC3923] (Saint-Andre, P., ???End-to-End Signing and Object Encryption for the Extensible Messaging and Presence Protocol (XMPP),??? October 2004.) has never been implemented in XMPP clients to the best of our knowledge, but has some attractive features, especially the ability to store-and-forward an encrypted message at a user's server if the user is not online whe
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