(Elgamal encryption): given elgamal encryption ciphersystem: a)show how can we create a new legal encryption from...

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(Elgamal encryption): given elgamal encryption ciphersystem:

a)show how can we create a new legal encryption from twodifferent encryptions that we don't know their decryptions

b)how can an adversary take advantage of the scheme at a)(what's written above), in order to attack a preknown encryptedtext? elaborate

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