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Message Authentication Codes MAC security Mac-forge a, (n) 1 iff 1. Vrfyk(m ,t 1 & 2. m not in Q (Gen, Mac, Vrfy) security parameter

Message Authentication Codes

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MAC security Mac-forge a, (n) 1 iff 1. Vrfyk(m ,t 1 & 2. m not in Q (Gen, Mac, Vrfy) security parameter 1n T t A Mac (k, Gen (17) k m1, m2, Mack (mi) -ti m ,t MAC n is secure if v PPT adversary A, 3a negligible function v(n) s.t. Prl Mac forge an (n) 1lsv (n) Figure 3: Security definition for message authentication codes

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