Welcome to the resource topic for 2015/151
Title:
Bad directions in cryptographic hash functions
Authors: Daniel J. Bernstein, Andreas Hülsing, Tanja Lange, Ruben Niederhagen
Abstract:A 25-gigabyte “point obfuscation” challenge “using security parameter 60” was announced at the Crypto 2015 rump session; “point obfuscation” is another name for password hashing. This paper shows that the particular matrix-multiplication hash function used in the challenge is much less secure than previous password-hashing functions are believed to be. This paper’s attack algorithm broke the challenge in just 19 minutes using a cluster of 21 PCs.
ePrint: https://eprint.iacr.org/2015/151
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