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Key exchange (also key establishment) is a method in cryptography by which cryptographic keys are exchanged between two parties, allowing use of a cryptographic algorithm. In the Diffie?Hellman key exchange scheme, each party generates a public/private key pair and distributes the public key.

The IKE protocol uses UDP packets, usually on port 500, and generally requires 4?6 packets with 2?3 round trips to create an ISAKMP security association (SA) on both sides. The negotiated key material is then given to the IPsec stack.

Internet Key Exchange version 2 (IKEv2) is a tunneling protocol, based on IPsec, that establishes a secure VPN communication between VPN devices and defines negotiation and authentication processes for IPsec security associations (SAs).

Internet Key Exchange version 2 (IKEv2) is an IPsec based tunneling protocol that provides a secure VPN communication channel between peer VPN devices and defines negotiation and authentication for IPsec security associations (SAs) in a protected manner.

IKE is a part of IPsec, a suite of protocols and algorithms used to secure sensitive data transmitted across a network. The Internet Engineering Task Force (IETF) developed IPsec to provide security through authentication and encryption of IP network packets and secure VPNs.

The Internet Key Exchange version 2 (IKEv2) Protocol dynamically establishes and maintains a shared state between the end-points of an IP datagram. IKEv2 performs mutual authentication between two parties and establishes the IKEv2 Security Association (SA).

IKE negotiation includes two phases: Phase 1?Negotiate exchange of proposals for how to authenticate and secure the channel. Phase 2?Negotiate security associations (SAs) to secure the data that traverses through the IPsec tunnel.