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Ephemerality does not refer to "a new session key being made each time a new session is set up", it refers to both parties' key pairs (and group elements) being freshly chosen. ‚ÄčThese Diffie-Hellman key pairs are should be ephemeral for forward secrecy; the session key is always ephemeral, even if static-static Diffie-Hellman is applied. Any nonces are used ...

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