Question: Problem 3.4 Let F be a pseudorandom permutation. Consider the mode of operation in which a uniform value ctr e {0, 1} is chosen, and

Problem 3.4 Let F be a pseudorandom permutation. Consider the mode

Problem 3.4 Let F be a pseudorandom permutation. Consider the mode of operation in which a uniform value ctr e {0, 1}" is chosen, and the ith ciphertext block c; is computed as Ci Ft(ctr + i + mi). Show that this scheme does not have indistinguishable encryptions in the presence of an eavesdropper. =

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