Question: This question from introduction to modern cryptography book Prove this theorem A private-key encryption scheme II = (Gen, Enc, Dec) has indistinguishabl-e -multiple encryptions in

This question from introduction to modern cryptography book

Prove this theorem

A private-key encryption scheme II = (Gen, Enc, Dec) has indistinguishabl-e -multiple encryptions in the presence of an eavesdropper if for all probabilistic polynomial-time adversaries A there exists a negligible function neg I such that

- Pr [PrivK A,II (n) = 1 ] J <= 1/2 + negl(n),

where the probability is taken over the random coins used by A, as well as the random coins used in the experiment (for choosing the key and the random bit b, as well as for the encryption itself)

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