Question: 4. User A sends a message to user B, and a digital signature is attached, as shown below. Explain how a malicious user C can

4. User A sends a message to user B, and a digital signature is attached, as shown below. Explain how a malicious user C can attack this system if the hash function H() is not weak collision resistant. Your explanation should say what C needs to do, and what C gains (or achieves) from the attack, and what happens at B for the attack to be successful

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