[Resource Topic] 2005/248: Collision-Resistant usage of MD5 and SHA-1 via Message Preprocessing

Welcome to the resource topic for 2005/248

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

Authors: Michael Szydlo, Yiqun Lisa Yin


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.

ePrint: https://eprint.iacr.org/2005/248

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