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IKE(Internet Key Exchange) A method for establishing a security association (SA) in the IPsec protocol. Introduced in 1998, IKE authenticates users, negotiates the encryption method and exchanges the secret key. Derived from the ISAKMP framework for key exchange and the Oakley and SKEME key exchange techniques, IKE uses public key cryptography to provide the secure transmission of the secret key to the recipient so that the encrypted data may be decrypted at the other end.
IKEv2 and MOBIKE
In 2006, Version 2 of IKE was introduced as a complete overhaul of the original version. IKEv2 was designed to simplify the protocol, support EAP and NAT traversal, as well as prevent spoofing attacks. Instead of a fixed number of packets, IKEv2 allows 30 or more packets to be exchanged.
IKEv2 Mobility and Multihoming (MOBIKE) is an extension to IKEv2 that supports mobile devices by enabling the IP address to change due to a change in venue. See IPsec, SA, NAT and EAP.