Explain how to forge the mac for a two-block message of, Computer Engineering

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Explain how to forge the mac for a two-block message of

Question :

Suppose message (a) is one block long. Suppose that an attacker has received the MAC (t) for a using CBC-MAC under some random key unknown to the attacker.

Explain how to forge the MAC for a two-block message of your choice. What is the two-block message that you chose?

What is the tag that you chose? Why is your chosen tag a valid tag for your two-block message?

Tips on how to solve this problem from Cryptography Engineering.

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Computer Engineering: Explain how to forge the mac for a two-block message of

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