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In computing, Internet Key Exchange (IKE, sometimes IKEv1 or IKEv2, depending on version) is the protocol used to set up a security association (SA) in the IPsec protocol suite. IKE builds upon the Oakley protocol and ISAKMP. IKE uses X.509 certificates for authentication ‒ either pre-shared or distributed using DNS (preferably with DNSSEC) ‒ and a Diffie–Hellman key exchange to set up a shared session secret from which cryptographic keys are derived. In addition, a security policy for every peer which will connect must be manually maintained.
IKEv2 (Internet Key Exchange version 2) is a VPN encryption protocol that handles request and response actions. It makes sure the traffic is secure by establishing and handling the SA (Security Association) attribute within an authentication suite – usually IPSec since IKEv2 is basically based on it and built into it.