International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Michael Szydlo

Publications

Year
Venue
Title
2005
EPRINT
Collision-Resistant usage of MD5 and SHA-1 via Message Preprocessing
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.
2004
EUROCRYPT
2003
EUROCRYPT
2002
CRYPTO
2002
EUROCRYPT
2001
ASIACRYPT