What mathematical problem is behind the security of the ElGamal cryptosystem? (short answer)
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What mathematical problem is behind security of the RSA cryptosystem? [ very short answer expected]
Consider ElGamal cryptosystem with p = 37, g = 2 and a = 31. (a) Give the public key. (b) Bob wants to send the message m = 19 to Alice. Bob chooses the random number r = 7. What is the ciphertext that Bob sends? (c) Show how Alice recovers the message.
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