Question: Let M denote computing a CBC-MAC under some cipher. Suppose x and y are two string of bits that are multiples of the block length

Let M denote computing a CBC-MAC under some cipher. Suppose x and y are two string of bits that are multiples of the block length of the cipher such that M(x) = M(y). Show how to create two other messages x’ and y’ such that M(x’) = M(y’). How many such pairs can be made?

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CBCMAC for message authentication For our purposes lets only consider CBCMAC with the AES block cipher and assume that CBCMAC only takes inputs that are a multiple of 128 bits long But we do allow CBC... View full answer

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