Question: Message Authentication Code (MAC) Consider the following MAC construction that uses AES. Given a message M, it is padded to so that its length in

Message Authentication Code (MAC)

Message Authentication Code (MAC) Consider the following MAC construction that uses AES.

Consider the following MAC construction that uses AES. Given a message M, it is padded to so that its length in bits is a multiple of 128, and divided into blocks of 128 bits each: M1, M2, ..., Me. The MAC value under a key k is defined as MACk(M) = AESk(M1) o AESk(M2) 0 AESk(Me). Show that this MAC construction is insecure by giving a concrete attack. Consider the following MAC construction that uses AES. Given a message M, it is padded to so that its length in bits is a multiple of 128, and divided into blocks of 128 bits each: M1, M2, ..., Me. The MAC value under a key k is defined as MACk(M) = AESk(M1) o AESk(M2) 0 AESk(Me). Show that this MAC construction is insecure by giving a concrete attack

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