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There exists a message authentication code such that its tag does not provide secrecy . Particularly, you need to describe ( 1 ) a secure
There exists a message authentication code such that its tag does not
provide secrecy
Particularly, you need to describe a secure message authentication
code KeyGenTag Verify An adversarys strategy in the semantic
security game of encryption: he provides m m and gets C Tagmb
where b is a uniform bit from From the ciphertext C adversary is
going to send another bit b
and wins if b b
Your adversary should be
able to win with probability better than significantly.
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