Question

Which one is not true for MAC and one way has functions?
(1) An alternative to the message authentication code is the one-way hash function. .
(2) A hash function accepts a variable-size message M as input and produces a fixed-size message digest H(M) as output.
(3) A hash function takes a secret key as input.
(4) To authenticate a message, the message digest is sent with the message in such a way that the message digest is authentic.

Answer 1

Option 2.

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Answer 2

To authenticate a message, the message digest is sent with the message in such a way that the message digest is authentic.