Network Working Group                               L. Hornquist Astrand
Internet-Draft                                                Apple, Inc
Intended status: Standards Track                           July 31, 2009
Expires: February 1, 2010


                Move DES to Historic Status for Kerberos
                      draft-lha-des-die-die-die-00

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Abstract

   A long long time ago DES was standardized.  Some 30 years later
   (2003) is was withdrawn as a standard by NIST, today 6 years later,
   its time for DES to finally die.  By 2008 it was possible to brute
   force DES keys in 6.4 days using less than USD 10k worth of hardware.
   So by 2008 DES had passsed its sell-by date.  Use in Kerberos should
   therefore stop.











































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1.  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].














































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2.  Background

   Kerberos 5 was defined in [RFC1510] and updated in [RFC4120], the
   Kerberos crypto system is defined by [RFC3961] and includes support
   for DES encryption types.  This document move all of the DES
   encryption types to historic.

   DES was withdrawn in [DES-Transition-Plan] by NIST.











































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3.  Recommendations

   Kerberos implementation and deployments SHOULD NOT use the single DES
   encryption: DES-CBC-MD5, DES-CBC-MD4, DES-CBC-CRC.















































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4.  Security Considerations

   Removing support for single DES improves security since DES is
   considered to be insecure by most parties.















































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5.  IANA Considerations

   There are no IANA Considerations for this document
















































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6.  References

6.1.  Normative References

   [RFC1510]  Kohl, J. and B. Neuman, "The Kerberos Network
              Authentication Service (V5)", RFC 1510, September 1993.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3961]  Raeburn, K., "Encryption and Checksum Specifications for
              Kerberos 5", RFC 3961, February 2005.

   [RFC4120]  Neuman, C., Yu, T., Hartman, S., and K. Raeburn, "The
              Kerberos Network Authentication Service (V5)", RFC 4120,
              July 2005.

6.2.  Informative References

   [DES-Transition-Plan]
              National Institute of Standards and Technology, "DES
              Transition Plan - Federal Register / Vol. 70, No. 96",
              May 2006.




























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Author's Address

   Love Hornquist Astrand
   Apple, Inc
   Cupertino
   USA

   Email: lha@apple.com











































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