What is Internet Key Exchange?
'''Internet Key Exchange''' ('''IKE''' or '''IKEv2''') is the [[wikt:protocol|protocol]] used to set up a [[security association]] (SA) in the [[IPsec]] protocol suite. IKE uses a [[Diffie-Hellman key exchange]] to set up a [[shared secret|shared session secret]], from which [[Key (cryptography)|cryptographic keys]] are derived. [[Public-key cryptography|Public key]] [[technique]]s or, alternatively, a [[pre-shared key]], are used to [[Mutual authentication|mutually authenticate]] the communicating parties. IKE builds upon the [[Oakley protocol]]. == History == IKE was originally defined in November 1998 by the [[Internet Engineering Task Force]] (IETF) in a series of publications ([[Request for Comments]]) known as [[Rfc:2407|RFC 2407]], [[Rfc:2408|RFC 2408]], and [[Rfc:2409|RFC 2409]]. * [[Rfc:2407|RFC 2407]] defined The Internet IP Security Domain of Interpretation for ISAKMP. <ref>{{cite web|title=RFC 2407 The Internet IP Security Domain of Interpretation for ISAKMP |publisher= Internet Engineering Task Force (IETF) |url=http://www.ietf.org/rfc/rfc2407.txt }}</ref> * [[Rfc:2408|RFC 2408]] Internet Security Association and Key Management Protocol (ISAKMP) <ref>{{cite web|title=RFC 2408 Internet Security Association and Key Management Protocol (ISAKMP) |publisher=Internet Engineering Task Force (IETF) |url=http://www.ietf.org/rfc/rfc2408.txt }}</ref> * [[Rfc:2409|RFC 2409]] defined The Internet Key Exchange (IKE) <ref>{{cite web|title=RFC 2409 The Internet Key Exchange (IKE) |publisher=Internet Engineering Task Force (IETF) |url=http://www.ietf.org/rfc/rfc2409.txt }}</ref> IKE was updated to version two (IKEv2) in December 2005 by [[Rfc:4306|RFC 4306]]. <ref>{{cite web|title=RFC 4306 Internet Key Exchange (IKEv2) Protocol |publisher=Internet Engineering Task Force (IETF) |author=C. Kaufman (Microsoft) |date=December 2005 |url=http://www.ietf.org/rfc/rfc4306.txt }}</ref> IKEv2 has been further expanded by [[Rfc:4301|RFC 4301]] (Security Architecture for the [[Internet Protocol]]) through [[Rfc:4310|RFC 43