Question: MACs are, in principle, also vulnerable against collision attacks. We discuss the issue in the following. Assume attacker found a collision between two messages, that

MACs are, in principle, also vulnerable against collision attacks. We discuss the issue in the following.
Assume attacker found a collision between two messages, that is:
MACk(x1)= MACk(x2)
Show a simple protocol with an attack that is based on a collision.

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