Question: This exercise is from Introduction to Modern Cryptography (2nd Edition) by Katz & Lindell Consider defining a MAC by Mack (m)-H(? m) where H is

This exercise is from Introduction to Modern Cryptography (2nd Edition) by KatzThis exercise is from Introduction to Modern Cryptography (2nd Edition) by Katz & Lindell

Consider defining a MAC by Mack (m)-H"(? m) where H is a collision-resistant hash function. Show that this is not a secure MAC when H is constructed via the Merkle-Damgard transform. As usual, assume that the hash key s is publicly known

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