Question: 3 . Let F be a pseudorandom permutation. Consider the mode of operation in which a uniform value ctr in { 0 , 1 }

3. Let F be a pseudorandom permutation. Consider the mode of operation in which a uniform value ctr in {0,1}n is chosen, and the ith ciphertext block ci is computed as
ci := Fk(ctr + i + mi). Show that this scheme does not have indistinguishable encryptions in the presence of an eavesdropper.

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