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Crypto-Agility Requirements for Remote Authentication Dial-In User Service (RADIUS)
RFC 6421

Internet Engineering Task Force (IETF)                    D. Nelson, Ed.
Request for Comments: 6421                         Elbrys Networks, Inc.
Category: Informational                                    November 2011
ISSN: 2070-1721

                      Crypto-Agility Requirements
        for Remote Authentication Dial-In User Service (RADIUS)

Abstract

   This memo describes the requirements for a crypto-agility solution
   for Remote Authentication Dial-In User Service (RADIUS).

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6421.

Copyright Notice

   Copyright (c) 2011 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.

Nelson                        Informational                     [Page 1]
RFC 6421         Crypto-Agility Requirements for RADIUS    November 2011

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................2
      1.1. General ....................................................2
      1.2. Requirements Language ......................................3
      1.3. Publication Process ........................................3
   2. A Working Definition of Crypto-Agility ..........................4
   3. The Current State of RADIUS Security ............................5
   4. The Requirements ................................................5
      4.1. Overall Solution Approach ..................................5
      4.2. Security Services ..........................................6
      4.3. Backwards Compatibility ....................................7
      4.4. Interoperability and Change Control ........................9
      4.5. Scope of Work ..............................................9
      4.6. Applicability of Automated Key Management Requirements .....9
   5. Security Considerations ........................................10
   6. Acknowledgments ................................................10
   7. References .....................................................10
      7.1. Normative References ......................................10
      7.2. Informative References ....................................11

1.  Introduction

1.1.  General

   At the IETF 66 meeting, the RADIUS Extensions (RADEXT) Working Group
   (WG) was asked by members of the Security Area Directorate to prepare
   a formal description of a crypto-agility work item and corresponding
   charter milestones.  After consultation with one of the Security Area
   Directors (Russ Housley), text was initially proposed on the RADEXT
   WG mailing list on October 26, 2006.  The following summarizes that
   proposal:

Nelson                        Informational                     [Page 2]
RFC 6421         Crypto-Agility Requirements for RADIUS    November 2011

      The RADEXT WG will review the security requirements for crypto-

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