TAILIEUCHUNG - Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms

MD5 [MD5] 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. The published attacks against MD5 show that it is not prudent to use MD5 when collision resistance is required. This document replaces the security considerations in RFC 1321 [MD5]. [HMAC] defined a mechanism for message authentication using cryptographic hash functions. Any message digest algorithm can be used, but the cryptographic strength of HMAC depends on the properties of the underlying hash function. [HMAC-MD5] defined test cases for HMAC-MD5. This document updates the security considerations in [HMAC], which [HMAC-MD5] points to for its. | Internet Engineering Task Force IETF Request for Comments 6151 Updates 1321 2104 Category Informational ISSNĨ 2070-1721 S. Turner IECA L. Chen NIST March 2011 Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms Abstract This document updates the security considerations for the MD5 message digest algorithm. It also updates the security considerations for HMAC-MD5. 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 info rfc6151. 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 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 of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Turner Chen Informational Page 1 RFC 6151 MD5 and HMAC-MD5 Security Considerations March 2011 1. Introduction MD5 MD5 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. The published attacks against MD5

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