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Suppose we have a block cipher with block size and 3-bit keys . Encrypt...
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Suppose we have a block cipher with block size and 3-bit keys . Encryption is as follows:
where is binary bitwise addition. (So , where , . For example, . )
Alice wishes to send a message to Bob with data origin authentication, where
Suppose Alice and Bob agreed to use the above block cipher to compute CBC-MACs without the optional processing and truncating, and suppose they agree on the key .
What is the message authentication code MAC on Alice's message?
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