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Forward secrecy
In cryptography, forward secrecy (FS; also known as perfect forward secrecy〔IEEE 1363-2000: IEEE Standard Specifications For Public Key Cryptography. Institute of Electrical and Electronics Engineers, 2000. http://grouper.ieee.org/groups/1363/〕) is a property of secure communication protocols: a secure communication protocol is said to have forward secrecy if compromise of long-term keys does not compromise past session keys.〔 FS protects past sessions against future compromises of secret keys or passwords. If forward secrecy is utilized, encrypted communications recorded in the past cannot be retrieved and decrypted should long-term secret keys or passwords be compromised in the future.
==History==
The term "perfect forward secrecy" was coined by C. G. Günther in 1990 and further discussed by Whitfield Diffie, Paul van Oorschot, and Michael James Wiener in 1992 where it was used to describe a property of the Station-to-Station protocol.
Forward secrecy has also been used to describe the analogous property of password-authenticated key agreement protocols where the long-term secret is a (shared) password.
Annex D.5.1 of IEEE 1363-2000 discusses the related one-party and two-party forward secrecy properties of various standard key agreement schemes (for two-party forward secrecy properties compare below 2WIPFS: "2-Way-Instant-Forward-Perfect-Secrecy").
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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