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 Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on February 1, 2010. Copyright Notice Copyright (c) 2009 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 in effect on the date of publication of this document (http://trustee.ietf.org/license-info). Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Hornquist Astrand Expires February 1, 2010 [Page 1] Internet-Draft Move DES to Historic Status for Kerberos July 2009 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 Some 30 years later (2003) is was withdrawn as a standard by NIST, today 6 years later, its time for DES to finally die.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. Hornquist Astrand Expires February 1, 2010 [Page 2] Internet-Draft Move DES to Historic Status for Kerberos July 2009 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]. Hornquist Astrand Expires February 1, 2010 [Page 3] Internet-Draft Move DES to Historic Status for Kerberos July 2009 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. Hornquist Astrand Expires February 1, 2010 [Page 4] Internet-Draft Move DES to Historic Status for Kerberos July 2009 3. Recommendations Kerberos implementation and deployments SHOULD NOT use the single DES encryption: DES-CBC-MD5, DES-CBC-MD4, DES-CBC-CRC. Hornquist Astrand Expires February 1, 2010 [Page 5] Internet-Draft Move DES to Historic Status for Kerberos July 2009 4. Security Considerations Removing support for single DES improves security since DES is considered to be insecure by most parties. Hornquist Astrand Expires February 1, 2010 [Page 6] Internet-Draft Move DES to Historic Status for Kerberos July 2009 5. IANA Considerations There are no IANA Considerations for this document Hornquist Astrand Expires February 1, 2010 [Page 7] Internet-Draft Move DES to Historic Status for Kerberos July 2009 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. Hornquist Astrand Expires February 1, 2010 [Page 8] Internet-Draft Move DES to Historic Status for Kerberos July 2009 Author's Address Love Hornquist Astrand Apple, Inc Cupertino USA Email: lha@apple.com Hornquist Astrand Expires February 1, 2010 [Page 9]