Question: Authentication over a network is a challenge because O a. There is no way to share a secret between two users n O b. Attacker

Authentication over a network is a challenge because O a. There is no way to share a secret between two users n O b. Attacker can only replay messages O c. The sender and the receiver can not use symmetric key encryption Od. Attacker can encrypt a message Oe. None of the answers is correct

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