b. suppose that machine a and machine b possession of the same secret key. machine a wishes to authenticate machine b with the following scheme machine a generates a random bit string the same length of the secret key. XOR it with the secret key and sends it to machine b. machine b XORs the incoming message with the secret key and sends it back. machine a checks and if the original random string is obtained, then machine a is convinced that machine b had the same secret key and therefore authentication process is complete.

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