Deprecate 3DES and RC4 in Kerberos
draft-ietf-curdle-des-des-des-die-die-die-00

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Last updated 2017-05-19 (latest revision 2017-05-02)
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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: Informational                               May 1, 2017
Expires: November 2, 2017

                   Deprecate 3DES and RC4 in Kerberos
              draft-ietf-curdle-des-des-des-die-die-die-00

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.

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
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   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on November 2, 2017.

Copyright Notice

   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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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 . . . . . . . . . . . . . . . . . . .   5
     6.2.  Interoperability  . . . . . . . . . . . . . . . . . . . .   6
     6.3.  Block Size  . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     10.2.  Informative References . . . . . . . . . . . . . . . . .   8
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   8
   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.

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

   The RC4 Kerberos encryption types are specified in [RFC4757], which
   is moved to historic.

   The des3-cbc-sha1-kd encryption type is specified in [RFC3961].
   Additional 3DES encryption types are in use with no formal
   specification, in particular des3-cbc-md5 and des3-cbc-sha1.  These
   unspecified encryption types are also deprecated by this document.

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