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EAP Re-authentication Protocol Extensions for Authenticated Anticipatory Keying (ERP/AAK)
RFC 6630

Internet Engineering Task Force (IETF)                            Z. Cao
Request for Comments: 6630                                       H. Deng
Category: Standards Track                                   China Mobile
ISSN: 2070-1721                                                    Q. Wu
                                                                  Huawei
                                                            G. Zorn, Ed.
                                                             Network Zen
                                                               June 2012

               EAP Re-authentication Protocol Extensions
            for Authenticated Anticipatory Keying (ERP/AAK)

Abstract

   The Extensible Authentication Protocol (EAP) is a generic framework
   supporting multiple types of authentication methods.

   The EAP Re-authentication Protocol (ERP) specifies extensions to EAP
   and the EAP keying hierarchy to support an EAP method-independent
   protocol for efficient re-authentication between the peer and an EAP
   re-authentication server through any authenticator.

   Authenticated Anticipatory Keying (AAK) is a method by which
   cryptographic keying material may be established upon one or more
   Candidate Attachment Points (CAPs) prior to handover.  AAK uses the
   AAA infrastructure for key transport.

   This document specifies the extensions necessary to enable AAK
   support in ERP.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6630.

Cao, et al.                  Standards Track                    [Page 1]
RFC 6630                         ERP/AAK                       June 2012

Copyright Notice

   Copyright (c) 2012 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     2.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  3
     2.2.  Acronyms . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  ERP/AAK Description  . . . . . . . . . . . . . . . . . . . . .  4
   4.  ERP/AAK Key Hierarchy  . . . . . . . . . . . . . . . . . . . .  7
     4.1.  Derivation of the pRK and pMSK . . . . . . . . . . . . . .  8
   5.  Packet and TLV Extension . . . . . . . . . . . . . . . . . . .  9
     5.1.  EAP-Initiate/Re-auth-Start Packet and TLV Extension  . . .  9
     5.2.  EAP-Initiate/Re-auth Packet and TLV Extension  . . . . . . 10
     5.3.  EAP-Finish/Re-auth Packet and TLV Extension  . . . . . . . 12
     5.4.  TV and TLV Attributes  . . . . . . . . . . . . . . . . . . 14
   6.  Lower-Layer Considerations . . . . . . . . . . . . . . . . . . 15
   7.  AAA Transport Considerations . . . . . . . . . . . . . . . . . 15
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 15
   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 16
   10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18
   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     11.1. Normative References . . . . . . . . . . . . . . . . . . . 18
     11.2. Informative References . . . . . . . . . . . . . . . . . . 19

Cao, et al.                  Standards Track                    [Page 2]
RFC 6630                         ERP/AAK                       June 2012

1.  Introduction

   The Extensible Authentication Protocol (EAP) [RFC3748] is a generic
   framework supporting multiple types of authentication methods.  In
   systems where EAP is used for authentication, it is desirable not to
   repeat the entire EAP exchange with another authenticator.  The EAP

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