Question: Consider AES - 2 5 6 bit encryption algorithm and CBC modes of operation. Using AES - 2 5 6 in CBC mode we define

Consider AES-256 bit encryption algorithm and CBC modes of operation.
Using AES-256 in CBC mode we define a CBC-MAC. Let M1 be a message of
256 bit and CBC-MAC corresponding to M1 be T1. Let M1=m1|| m2 where
each m1 and m2 is of 128 bits. The MAC corresponding
to M2=M1||(m2
\oplus T1) will be,

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