NDLI: A new hash family obtained by modifying the SHA-2 family

Content Provider	ACM Digital Library
Author	Sanadhya, Somitra Kumar Sarkar, Palash
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.
Starting Page	353
Ending Page	363
Page Count	11
File Format	PDF
ISBN	9781605583945
DOI	10.1145/1533057.1533103
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-03-10
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Sha-2 hash family Reduced round attacks Cryptanalysis
Content Type	Text
Resource Type	Article

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A new hash family obtained by modifying the SHA-2 family