A protocol used to set up security associations (SA) in the IPsec protocol suite, Internet Key Exchange (IKE) builds upon the Oakley protocol and ISAKMP. It uses X.509 certificates for authentication and a Diffie-Hellman key exchange to set up a shared session secret from which cryptographic keys are derived. IKE has two versions: IKEv1 and IKEv2.
How IKE Works
IKE establishes a secure connection between two parties by negotiating security parameters and authenticating the communicating peers. It uses X.509 certificates for authentication, which can be pre-shared or distributed using DNS (preferably with DNSSEC).
- Authentication: IKE uses X.509 certificates for authentication, either pre-shared or distributed using DNS.
- Key Exchange: IKE employs a Diffie-Hellman key exchange to set up a shared session secret from which cryptographic keys are derived.
Quantum-Resistant Key Establishment
A draft by the IETF is currently being written to provide a quantum-resistant key establishment using ML-KEM. This is an ongoing effort to enhance the security of IKE in the face of quantum computing threats.
Security Policy Maintenance
A security policy for every peer that will connect must be manually maintained. This ensures that the communication is secure and that the peers are authenticated properly.