El gamal a variant of the diffie-Hellman key distribution scheme, allowing secure exchange of messages Published in 1985 by elgamal in T. ElGamal, a Public Key cryptosystem and a Signature Scheme Based on Discrete Logarithms IEEE Trans. Information Theory, vol IT-31(4), pp469- 472,July1985. Like Diffie-Hellman its security depends on the difficulty of factoring logarithms10 El Gamal • A variant of the Diffie-Hellman key distribution scheme, allowing secure exchange of messages • Published in 1985 by ElGamal in – T. ElGamal, "A Public Key Cryptosystem and a Signature Scheme Based on Discrete Logarithms", IEEE Trans. Information Theory, vol IT-31(4), pp469- 472, July 1985. • Like Diffie-Hellman its security depends on the difficulty of factoring logarithms