Paper 2015/151 Original: eprint.iacr.org/2015/151 ↗
Bad directions in cryptographic hash functions
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.
Metadata
- Available format(s)
PDF- Category
- Secret-key cryptography
- Publication info
- Preprint.
- History
- 2015-02-27: last updated
- 2015-02-27: published
- Short URL
- https://ia.cr/2015/151
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2015/151,
author = {Daniel J. Bernstein and Andreas Hülsing and Tanja Lange and Ruben Niederhagen},
title = {Bad directions in cryptographic hash functions},
howpublished = {Cryptology {ePrint} Archive, Paper 2015/151},
year = {2015},
url = {https://eprint.iacr.org/2015/151}
}