Question: Prove that a machine that solves Decisional Diffie-Hellman problem mod p can be used to decide the validity of mod p ElGamal ciphertexts, and a

Prove that a machine that solves Decisional Diffie-Hellman problem mod p can be used to decide the validity of mod p ElGamal ciphertexts, and a machine that decides the validity of mod p ElGamal ciphertexts can be used to solve Decision Diffie-Hellman problems mod p.

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