Question: Let F be a pseudorandom function. Show that the following MAC for messages of length 2n is insecure: Gen outputs a uniform k E 10,1;

Let F be a pseudorandom function. Show that the following MAC

Let F be a pseudorandom function. Show that the following MAC for messages of length 2n is insecure: Gen outputs a uniform k E 10,1"; to authenticate a message m! Il m2 with 1mil = 1m2|-n, compute the tag Fk(m) 11 Fk(Fr(m2))

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