MD4 to Historic Status
RFC 6150
| Document | Type |
RFC - Informational
(March 2011; Errata)
Obsoletes RFC 1320
Was draft-turner-md4-to-historic (individual in gen area)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6150 (Informational) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Robert Sparks | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) S. Turner
Request for Comments: 6150 IECA
Obsoletes: 1320 L. Chen
Category: Informational NIST
ISSN: 2070-1721 March 2011
MD4 to Historic Status
Abstract
This document retires RFC 1320, which documents the MD4 algorithm,
and discusses the reasons for doing so. This document moves RFC 1320
to Historic status.
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/rfc6150.
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.
Turner & Chen Informational [Page 1]
RFC 6150 MD2 to Historic Status March 2011
1. Introduction
MD4 [MD4] is a message digest algorithm that takes as input a message
of arbitrary length and produces as output a 128-bit "fingerprint" or
"message digest" of the input. This document retires [MD4].
Specifically, this document moves RFC 1320 [MD4] to Historic status.
The reasons for taking this action are discussed.
[HASH-Attack] summarizes the use of hashes in many protocols and
discusses how attacks against a message digest algorithm's one-way
and collision-free properties affect and do not affect Internet
protocols. Familiarity with [HASH-Attack] is assumed.
2. Rationale
MD4 was published in 1992 as an Informational RFC. Since its
publication, MD4 has been under attack [denBORBOS1992] [DOBB1995]
[DOBB1996] [GLRW2010] [WLDCY2005] [LUER2008]. In fact, RSA, in 1996,
suggested that MD4 should not be used [RSA-AdviceOnMD4]. Microsoft
also made similar statements [MS-AdviceOnMD4].
In Section 6, this document discusses attacks against MD4 that
indicate use of MD4 is no longer appropriate when collision
resistance is required. Section 6 also discusses attacks against
MD4's pre-image and second pre-image resistance. Additionally,
attacks against MD4 used in message authentication with a shared
secret (i.e., HMAC-MD4) are discussed.
3. Documents that Reference RFC 1320
Use of MD4 has been specified in the following RFCs:
Internet Standard (IS):
o [RFC2289] A One-Time Password System.
Draft Standard (DS):
o [RFC1629] Guidelines for OSI NSAP Allocation in the Internet.
Proposed Standard (PS):
o [RFC3961] Encryption and Checksum Specifications for Kerberos 5.
Best Current Practice (BCP):
o [RFC4086] Randomness Requirements for Security.
Turner & Chen Informational [Page 2]
RFC 6150 MD2 to Historic Status March 2011
Informational:
o [RFC1760] The S/KEY One-Time Password System.
o [RFC1983] Internet Users' Glossary.
o [RFC2433] Microsoft PPP CHAP Extensions.
o [RFC2759] Microsoft PPP CHAP Extensions, Version 2.
o [RFC3174] US Secure Hash Algorithm 1 (SHA1).
o [RFC4757] The RC4-HMAC Kerberos Encryption Types Used by
Microsoft Windows.
o [RFC5126] CMS Advanced Electronic Signatures (CAdES).
There are other RFCs that refer to MD2, but they have been either
moved to Historic status or obsoleted by a later RFC. References and
discussions about these RFCs are omitted. The notable exceptions
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