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Paper 2005/248

Collision-Resistant usage of MD5 and SHA-1 via Message Preprocessing

Michael Szydlo and Yiqun Lisa Yin

Abstract

A series of recent papers have demonstrated collision attacks on popularly used hash functions, including the widely deployed MD5 and SHA-1 algorithm. To assess this threat, the natural response has been to evaluate the extent to which various protocols actually depend on collision resistance for their security, and potentially schedule an upgrade to a stronger hash function. Other options involve altering the protocol in some way. This work suggests a different option. We present several simple message pre-processing techniques and show how the techniques can be combined with MD5 or SHA-1 so that applications are no longer vulnerable to the known collision attacks. For some applications, this may a viable alternative to upgrading the hash function.

Metadata
Available format(s)
PDF PS
Publication info
Published elsewhere. RSA Conference 2006
Keywords
SHA-1MD5paddinghash collisionsignature
Contact author(s)
mszydlo @ rsasecurity com
History
2005-10-18: revised
2005-07-30: received
See all versions
Short URL
https://ia.cr/2005/248
License
Creative Commons Attribution
CC BY
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