Multiple Key Exchanges in IKEv2
draft-ietf-ipsecme-ikev2-multiple-ke-01

Document Type Active Internet-Draft (ipsecme WG)
Last updated 2020-07-10
Replaces draft-tjhai-ipsecme-hybrid-qske-ikev2
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Internet Engineering Task Force (IETF)                          C. Tjhai
Internet-Draft                                              M. Tomlinson
Updates: 7296 (if approved)                                 Post-Quantum
Intended status: Standards Track                             G. Bartlett
Expires: January 8, 2021                                  Quantum Secret
                                                              S. Fluhrer
                                                           Cisco Systems
                                                            D. Van Geest
                                                       ISARA Corporation
                                                       O. Garcia-Morchon
                                                                 Philips
                                                              V. Smyslov
                                                              ELVIS-PLUS
                                                            July 7, 2020

                    Multiple Key Exchanges in IKEv2
                draft-ietf-ipsecme-ikev2-multiple-ke-01

Abstract

   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.  The primary application of this feature in IKEv2 is the
   ability to perform one or more post-quantum key exchanges in
   conjunction with the classical (Elliptic Curve) Diffie-Hellman key
   exchange, so that the resulting shared key is resistant against
   quantum computer attacks.  Another possible application is the
   ability to combine several key exchanges in situations when no single
   key exchange algorithm is trusted by both initiator and responder.

   This document updates RFC7296 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.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute

Tjhai, et al.            Expires January 8, 2021                [Page 1]
Internet-Draft       Multiple Key Exchanges in IKEv2           July 2020

   working documents as Internet-Drafts.  The list of current Internet-
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   This Internet-Draft will expire on January 8, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Problem Description . . . . . . . . . . . . . . . . . . .   3
     1.2.  Proposed Extension  . . . . . . . . . . . . . . . . . . .   3
     1.3.  Changes . . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.4.  Document Organization . . . . . . . . . . . . . . . . . .   5
   2.  Design Criteria . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Multiple Key Exchanges  . . . . . . . . . . . . . . . . . . .   8
     3.1.  Overall Design  . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  Overall Protocol  . . . . . . . . . . . . . . . . . . . .   9
       3.2.1.  IKE_SA_INIT Round: Negotiation  . . . . . . . . . . .  10
       3.2.2.  IKE_INTERMEDIATE Round: Additional Key Exchanges  . .  11
       3.2.3.  IKE_AUTH Exchange . . . . . . . . . . . . . . . . . .  12
       3.2.4.  CREATE_CHILD_SA Exchange  . . . . . . . . . . . . . .  12
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
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