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Why was the term (perfect) originally attached to forward secrecy No reason is given by Christoph G. G√ľnther in An Identity-Based Key-Exchange Protocol (in proceedings of Eurocrypt 1989), which is the earliest use on record and claims the notion: This modification restores a property of the Diffie-Hellman scheme, which we could call perfect forward ...


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Forward secrecy of key-establishment (KE) protocol means, that compromising of long-term keys of parties doesn't affect secrecy of established keys in the past. Example to clarify what PFS means. Say parties A and B have private keys $s_B$ and $s_B$. Today they run KE and establish a key $k_1$. They use this key during a session, and then destroy this key. ...


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