2007 | OriginalPaper | Buchkapitel
Collisions for 70-Step SHA-1: On the Full Cost of Collision Search
verfasst von : Christophe De Cannière, Florian Mendel, Christian Rechberger
Erschienen in: Selected Areas in Cryptography
Verlag: Springer Berlin Heidelberg
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The diversity of methods for fast collision search in SHA-1 and similar hash functions makes a comparison of them difficult. The literature is at times very vague on this issue, which makes comparison even harder. In situations where differences in estimates of attack complexity of a small factor might influence short-term recommendations of standardization bodies, uncertainties and ambiguities in the literature amounting to a similar order of magnitude are unhelpful. We survey different techniques and propose a simple but effective method to facilitate comparison. In a case study, we consider a newly developed attack on 70-step SHA-1, and give complexity estimates and performance measurements of this new and improved collision search method.