Question: Suppose Alice uses the NeedhamSchroeder authentication protocol to initiate a session with Bob. Further suppose that an adversary is able to eavesdrop on the authentication

Suppose Alice uses the Needham–Schroeder authentication protocol to initiate a session with Bob. Further suppose that an adversary is able to eavesdrop on the authentication messages and, long after the session has completed, discover the (unencrypted) session key. How could the adversary deceive Bob into authenticating the adversary as Alice?

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