Weak perfect forward secrecy Sample Clauses

Weak perfect forward secrecy. If the long-term private keys of entities A and B are compromised, previously established session keys will still remain unknown to an adversary due to the key derivation function H(K abP xAxBP). As the adversary does not know any of the ephermeral values used in a session, she must compute abP from aP and bP which is the CDH problem. Here, we assume that the ad- versary has not been actively involved in the choice of temporary information of past sessions, and thus obtain the property of weak perfect forward secrecy [36]. If a KDF had not been used, an attacker could easily recover the shared key by computing K = ê(SB′ , TA) · ê(SA′ , TB).
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