http://www.rfc-editor.org/rfc/rfc6151.txt
RFC 6151: Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 Algorithms, S. Turner, L. Chen2011-03-01T23:00:00-00:00This document updates the security considerations for the MD5 message digest algorithm. It also updates the security considerations for HMAC-MD5. This document is not an Internet Standards Track specification; it is published for informational purposes.