Paper 2015/151
Bad directions in cryptographic hash functions
Daniel J. Bernstein, Andreas Hülsing, Tanja Lange, and 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.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Preprint. MINOR revision.
- Keywords
- symmetric cryptographyhash functionspassword hashingpoint obfuscationmatrix multiplicationmeet-in-the-middle attacksmeet-in-many-middles attacks
- Contact author(s)
- authorcontact-obviouscation @ box cr yp to
- History
- 2015-02-27: received
- Short URL
- https://ia.cr/2015/151
- License
-
CC BY
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},
note = {\url{https://eprint.iacr.org/2015/151}},
url = {https://eprint.iacr.org/2015/151}
}
