RFC 9370

Multiple Key Exchanges in the Internet Key Exchange Protocol Version 2 (IKEv2), May 2023

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RFC 7296
CJ. Tjhai
M. Tomlinson
G. Bartlett
S. Fluhrer
D. Van Geest
O. Garcia-Morchon
V. Smyslov
ipsecme (sec)

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DOI:  https://doi.org/10.17487/RFC9370

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This document describes how to extend the Internet Key Exchange Protocol Version 2 (IKEv2) to allow multiple key exchanges to take place while computing a shared secret during a Security Association (SA) setup.

This document utilizes the IKE_INTERMEDIATE exchange, where multiple key exchanges are performed when an IKE SA is being established. It also introduces a new IKEv2 exchange, IKE_FOLLOWUP_KE, which is used for the same purpose when the IKE SA is being rekeyed or is creating additional Child SAs.

This document updates RFC 7296 by renaming a Transform Type 4 from "Diffie-Hellman Group (D-H)" to "Key Exchange Method (KE)" and renaming a field in the Key Exchange Payload from "Diffie-Hellman Group Num" to "Key Exchange Method". It also renames an IANA registry for this Transform Type from "Transform Type 4 - Diffie- Hellman Group Transform IDs" to "Transform Type 4 - Key Exchange Method Transform IDs". These changes generalize key exchange algorithms that can be used in IKEv2.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.

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