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Study PEM (Privacy Enhanced Mail). Design a mechanism to allow Alice and Bob to establish a secret key cryptographic interchange key, using something like Kerberos
Study PEM (Privacy Enhanced Mail). Design a mechanism to allow Alice and Bob to establish a secret key cryptographic interchange key, using something like Kerberos KDCs. For simplicity, assume that Alice and Bob are in the same realm. If Alice does not keep track of KDC-assigned interchange keys for people to whom she has previously sent messages, how can your design ensure that Alice will be able to later decrypt an encrypted message she sent to Bob? Also Justify your answer?
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