Paper 2007/295
Linearization Attacks Against Syndrome Based Hashes
Markku-Juhani O. Saarinen
Abstract
In MyCrypt 2005, Augot, Finiasz, and Sendrier proposed FSB, a family of cryptographic hash functions. The security claim of the FSB hashes is based on a coding theory problem with hard average-case complexity. In the ECRYPT 2007 Hash Function Workshop, new versions with essentially the same compression function but radically different security parameters and an additional final transformation were presented. We show that hardness of average-case complexity of the underlying problem is irrelevant in collision search by presenting a linearization method that can be used to produce collisions in a matter of seconds on a desktop PC for the variant of FSB with claimed $2^128$ security.
Note: Sample code for matrix arithmetic and pre-image search can be downloaded from: http://www.m-js.com/misc/fsb_test.tar.gz
Metadata
- Available format(s)
-
PDF
PS
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. INDOCRYPT 2007
- Keywords
- hash function cryptanalysisprovable securitylinearization attackFSB
- Contact author(s)
- m saarinen @ rhul ac uk
- History
- 2007-09-25: last of 6 revisions
- 2007-08-07: received
- See all versions
- Short URL
- https://ia.cr/2007/295
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2007/295,
author = {Markku-Juhani O. Saarinen},
title = {Linearization Attacks Against Syndrome Based Hashes},
howpublished = {Cryptology {ePrint} Archive, Paper 2007/295},
year = {2007},
url = {https://eprint.iacr.org/2007/295}
}
