Deprecate 3DES and RC4 in Kerberos
draft-ietf-curdle-des-des-des-die-die-die-03

Document Type Active Internet-Draft (curdle WG)
Last updated 2017-06-15
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Network Working Group                                           B. Kaduk
Internet-Draft                                                    Akamai
Obsoletes: 4757 (if approved)                                   M. Short
Updates: 3961 (if approved)                        Microsoft Corporation
Intended status: Best Current Practice                     June 15, 2017
Expires: December 17, 2017

                   Deprecate 3DES and RC4 in Kerberos
              draft-ietf-curdle-des-des-des-die-die-die-03

Abstract

   The 3DES and RC4 encryption types are steadily weakening in
   cryptographic strength, and the deprecation process should be begun
   for their use in Kerberos.  Accordingly, RFC 4757 is moved to
   Obsolete status, as none of the encryption types it specifies should
   be used, and RFC 3961 is updated to note the deprecation of the
   triple-DES encryption types.

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
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   This Internet-Draft will expire on December 17, 2017.

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   Copyright (c) 2017 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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Kaduk & Short           Expires December 17, 2017               [Page 1]
Internet-Draft     Deprecate 3DES and RC4 in Kerberos          June 2017

   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   2
   3.  Affected Specifications . . . . . . . . . . . . . . . . . . .   2
   4.  Affected Encryption Types . . . . . . . . . . . . . . . . . .   3
   5.  RC4 Weakness  . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.1.  Statistical Biases  . . . . . . . . . . . . . . . . . . .   3
     5.2.  Password Hash . . . . . . . . . . . . . . . . . . . . . .   4
     5.3.  Cross-Protocol Key Reuse  . . . . . . . . . . . . . . . .   4
     5.4.  Interoperability Concerns . . . . . . . . . . . . . . . .   5
   6.  3DES Weakness . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Password-based Keys . . . . . . . . . . . . . . . . . . .   6
     6.2.  Block Size  . . . . . . . . . . . . . . . . . . . . . . .   6
     6.3.  Interoperability  . . . . . . . . . . . . . . . . . . . .   6
   7.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     10.2.  Informative References . . . . . . . . . . . . . . . . .   8
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The 3DES and RC4 encryption types are steadily weakening in
   cryptographic strength, and the deprecation process should be begun
   for their use in Kerberos.  Accordingly, RFC 4757 is moved to
   Obsolete status, as none of the encryption types it specifies should
   be used, and RFC 3961 is updated to note the deprecation of the
   triple-DES encryption types.

2.  Requirements Notation

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Affected Specifications
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