A new hash family obtained by modifying the SHA-2 family
Somitra Kumar Sanadhya,Palash Sarkar +1 more
- pp 353-363
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TLDR
The general idea of "multiple feed-forward" for the construction of cryptographic hash functions is introduced, which can provide increased resistance to the Chabaud-Joux type "perturbation-correction" collision attacks.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.read more
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Journal ArticleDOI
A combinatorial analysis of recent attacks on step reduced SHA-2 family
TL;DR: This analysis explains in a unified way the recent attacks against reduced round SHA-2 in a general class of local collisions and shows that the previously used local collision by Nikolić and Biryukov and Sanadhya and Sarkar are special cases.
References
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Posted Content
New Local Collisions for the SHA-2 Hash Family.
TL;DR: A systematic study of local collisions for the SHA-2 family, where only one local collision due to Gilbert-Handschuh was known, and a general method for finding local collisions is described.
Posted Content
Analysis of Step-Reduced SHA-256.
TL;DR: In this paper, the authors analyzed the security of SHA-256 against fast collision search and showed that the low probability of a single local collision may give rise to a false sense of security.
Book ChapterDOI
Deterministic Constructions of 21-Step Collisions for the SHA-2 Hash Family
TL;DR: Two different deterministic attacks against 21-step SHA-2 hash family are constructed, and it is provided evidence that the Nikolic-Biryukov differential path is unlikely to yield 21- step collisions for SHA-512.
BookDOI
Selected Areas in Cryptography
TL;DR: The contribution shows that for low cost security applications genus-4 hyperelliptic curves (HEC) can outperform genus-2 HEC and that it can achieve a performance similar to genus-3 HEC, and the implementation results show that a genus- 4 HECC is an alternative cryptosystem to systems based on elliptic curves.
Journal ArticleDOI
A combinatorial analysis of recent attacks on step reduced SHA-2 family
TL;DR: This analysis explains in a unified way the recent attacks against reduced round SHA-2 in a general class of local collisions and shows that the previously used local collision by Nikolić and Biryukov and Sanadhya and Sarkar are special cases.