Question: Consider a MAC scheme where a MAC tag for a message m is generated as MACK(m) = H(K||m), where H: {0,1}* {0,1}' is a

   

Consider a MAC scheme where a MAC tag for a message m is generated as MACK(m) = H(K||m), where H: {0,1}* {0,1}' is a hash function and secret key K is random: i.e., K

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