Diffie-Hellman is an asymmetric cipher defined in U.S. Patent 4,200,770 in 1977, the same year that IBM’s algorithm was selected as the Data Encryption Standard.

The Diffie-Hellman patent expired on 6 September, 1997.

The Diffie-Hellman algorithm is named after its creators: Whitfield Diffie and Martin Hellman.

ElGamal is a variant of Diffie-Hellman which was invented by Taher Elgamal.

 

 

 

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