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Definition
The original Diffie-Hellman Key Agreement protocol allows two users to communicate over an insecure channel in order to produce a shared, symmetric key.
Background
The ability for two users to establish a shared, symmetric key over an insecure communication channel, despite having “not met previously” (more importantly, the users don’t already have shared key material) was first proposed by Diffie and Hellman in 1976. Till that time, two users would either need to have shared key material between them already, or rely upon a Key Distribution Center. While the original Diffie–Hellman protocol was susceptible to a Meet-in-the-Middle Attack, there have since been updated protocols that provide Key Authentication.
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Recommended Reading
Diffie W, Hellman ME (1976) New directions in cryptography. IEEE Trans Inf Theory IT-22(6):644–656
Menezes A, van Oorschot PC, Vanstone SA (1996) Handbook of applied cryptography. CRC Press, Boca Raton, FL
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© 2011 Springer Science+Business Media, LLC
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Just, M. (2011). Diffie–Hellman Key Agreement. In: van Tilborg, H.C.A., Jajodia, S. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5906-5_75
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DOI: https://doi.org/10.1007/978-1-4419-5906-5_75
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4419-5905-8
Online ISBN: 978-1-4419-5906-5
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