Abstract
In this paper we analyse the role of some of the building blocks of SHA-256. We show that the disturbance-correction strategy is applicable to the SHA-256 architecture and we prove that functions Σ σ are vital for the security of SHA-256 by showing that for a variant without them it is possible to find collisions with complexity 264 hash operations. As a step towards an analysis of the full function, we present the results of our experiments on Hamming weights of expanded messages for differ ent variants of the message expansion and show that there exist low-weight expanded messages for XOR-linearised variants.
Original language | English |
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Title of host publication | WEWoRC 2005 - Western European Workshop on Research in Cryptology |
Editors | Christopher Wolf, Stefan Lucks, Po-Wah Yau |
Place of Publication | Bonn |
Publisher | Gesellschaft für Informatik |
Pages | 123-134 |
Number of pages | 12 |
Volume | P-74 |
ISBN (Print) | 3885794039, 9783885794035 |
Publication status | Published - 2005 |
Event | 1st Western European Workshop on Research in Cryptology, WEWoRC - 2005 - Leuven, Belgium Duration: 5 Jul 2005 → 7 Jul 2005 |
Other
Other | 1st Western European Workshop on Research in Cryptology, WEWoRC - 2005 |
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Country/Territory | Belgium |
City | Leuven |
Period | 5/07/05 → 7/07/05 |