Question: Consider the basic CBC-MAC pictured, with a block cipher having a 128 bit key and 64 bit block length to MAC a 512 bit message.

Consider the basic CBC-MAC pictured, with a block cipher having a

Consider the basic CBC-MAC pictured, with a block cipher having a 128 bit key and 64 bit block length to MAC a 512 bit message. How many evaluations of the block cipher need to be performed in order to calculate the tag? Assume there is no padding

Characteristics Need 2 shared keys In general can generate additional keys from a single shared key k k1=Fk(1) k2=Fk(2)

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