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IKE is defined in RFC 2409. IKE uses a Diffie-Hellman key exchange to set up a shared session secret, from which cryptographic keys are derived. Public key techniques or, alternatively, preshared secrets, are used to mutually authenticate the communicating parties.
IKE incoporates parts of the proposed Oakley protocol .
IKEv2 expands upon IKEv1 in to-be-published Internet Drafts.Cryptographic protocols