Question: a. It is in principle possible to create a hash function by using CBC-MAC with a constant, public key. i. Discuss how to find a

a. It is in principle possible to create a hash function

a. It is in principle possible to create a hash function by using CBC-MAC with a constant, public key. i. Discuss how to find a single-block message m that hashes to a given digest d. L.e. show that this hash function is not pre-image resistant. (1 mark) ii. Extend your attack to find a message of a given length n. (1 mark) b. Padding can affect cryptography in surprising and subtle ways. Consider the following padding scheme for a CBC-MAC. We are given a message mm2..mn where mj is a full block for n

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