Paper 2008/272 Original: eprint.iacr.org/2008/272 ↗
A New Hash Family Obtained by Modifying the SHA-2 Family
Abstract
In this work, we study several properties of the SHA-2 design which have been utilized in recent collision attacks against reduced round SHA-2. Small modifications to the SHA-2 design are suggested to thwart these attacks. The modified round function provides the same resistance to linearization attacks as the original SHA-2 round function, but, provides better resistance to non-linear attacks. Our next contribution is to introduce the general idea of ``multiple feed-forward" for the construction of cryptographic hash functions. This can provide increased resistance to the Chabaud-Joux type ``perturbation-correction'' collision attacks. The idea of feed-forward is taken further by introducing the idea of feed-forward across message blocks leading to resistance against generic multi-collision attacks. The net effect of the suggested changes to the SHA-2 design has insignificant impact on the efficiency of computing the digest.
Metadata
- Available format(s)
PDF- Publication info
- Preprint.
- History
- 2010-02-11: last updated
- 2008-06-18: published
- Short URL
- https://ia.cr/2008/272
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2008/272,
author = {Somitra Kumar Sanadhya and Palash Sarkar},
title = {A New Hash Family Obtained by Modifying the SHA-2 Family},
howpublished = {Cryptology {ePrint} Archive, Paper 2008/272},
year = {2008},
url = {https://eprint.iacr.org/2008/272}
}