Published in 1976 by Diffie and Hellman, this is the earliest publicly known work that proposed the idea of a private key and a corresponding public key. DH is one of the earliest practical examples of public key exchange implemented within the field of cryptography. The shared secret can be used, for instance, as the key for a symmetric cipher.ĭiffie–Hellman key exchange is a mathematical method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after Whitfield Diffie and Martin Hellman. After obtaining an authentic copy of each other's public keys, Alice and Bob can compute a shared secret offline. Method of exchanging cryptographic keys In the Diffie–Hellman key exchange scheme, each party generates a public/private key pair and distributes the public key.
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