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Let me try to sum up what the landscape of end-to-end encrypted messaging protocols for group chat looks like: Protocols like PGP have been around for some time and offer "group messaging" by simply encrypting the content with a randomly generated symmetric key and then encrypting that key asymmetrically with the public keys of each of the recipients. ...


Such a thing doesn't exist, because the protocols and the encryption suites are largely orthogonal. For the most part, any encryption can be used with any protocol.


For third query, Since ssl session establishment use lengthy cryptography keys, so its consume more resources. Once session established one should use lighter process. So using Connection and Session logic, https become better in performance.

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