Diffie–Hellman Key Exchange

Diffie–Hellman key exchange (D–H) is a specific method of exchanging cryptographic keys. It is one of the earliest practical examples of key exchange implemented within the field of cryptography. The Diffie–Hellman key exchange method allows two parties that have no prior knowledge of each other to jointly establish a shared secret key over an insecure communications channel. This key can then be used to encrypt subsequent communications using a symmetric key cipher.

The scheme was first published by Whitfield Diffie and Martin Hellman in 1976, although it had been separately invented a few years earlier within GCHQ, the British signals intelligence agency, by Malcolm J. Williamson but was kept classified. In 2002, Hellman suggested the algorithm be called Diffie–Hellman–Merkle key exchange in recognition of Ralph Merkle's contribution to the invention of public-key cryptography (Hellman, 2002).

Although Diffie–Hellman key agreement itself is an anonymous (non-authenticated) key-agreement protocol, it provides the basis for a variety of authenticated protocols, and is used to provide perfect forward secrecy in Transport Layer Security's ephemeral modes (referred to as EDH or DHE depending on the cipher suite).

The method was followed shortly afterwards by RSA, an implementation of public key cryptography using asymmetric algorithms.

In 2002, Martin Hellman wrote:

The system...has since become known as Diffie–Hellman key exchange. While that system was first described in a paper by Diffie and me, it is a public key distribution system, a concept developed by Merkle, and hence should be called 'Diffie–Hellman–Merkle key exchange' if names are to be associated with it. I hope this small pulpit might help in that endeavor to recognize Merkle's equal contribution to the invention of public key cryptography.

U.S. Patent 4,200,770, now expired, describes the algorithm and credits Hellman, Diffie, and Merkle as inventors.

Read more about Diffie–Hellman Key Exchange:  Description, Operation With More Than Two Parties, Security

Other articles related to "key, exchange, key exchange":

Diffie–Hellman Key Exchange - Other Uses - Public Key
... It is also possible to use Diffie–Hellman as part of a public key infrastructure ... Alice's public key is simply ... sends Alice (un-encrypted) together with the message encrypted with symmetric key ...
The Key Exchange Problem - Diffie–Hellman Key Exchange
... In 1976, Whitfield Diffie and Martin Hellman published a cryptographic protocol, (Diffie–Hellman key exchange), which allows users to establish 'secure channels' on which to exchange keys, even if an Opponent is ... However, D–H key exchange did not address the problem of being sure of the actual identity of the person (or 'entity') ...

Famous quotes containing the words exchange and/or key:

    I cannot say what poetry is; I know that our sufferings and our concentrated joy, our states of plunging far and dark and turning to come back to the world—so that the moment of intense turning seems still and universal—all are here, in a music like the music of our time, like the hero and like the anonymous forgotten; and there is an exchange here in which our lives are met, and created.
    Muriel Rukeyser (1913–1980)

    I cannot tell what I am as much afraid of, as a woman who invariably washes on Monday. It is a kind of key to character; and if her mouth is not puckered and her brow wrinkled, they will be, unless she repents.
    Jane Grey Swisshelm (1815–1884)