R
Rafi Chen
Researcher at Technion – Israel Institute of Technology
Publications - 5
Citations - 831
Rafi Chen is an academic researcher from Technion – Israel Institute of Technology. The author has contributed to research in topics: Birthday attack & Collision resistance. The author has an hindex of 5, co-authored 5 publications receiving 803 citations.
Papers
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Book ChapterDOI
Near-collisions of SHA-0
Eli Biham,Rafi Chen +1 more
TL;DR: This paper finds two near-collisions of the full compression function ofSHA-0, in which up to 142 of the 160 bits of the output are equal, and shows that 82-round SHA-0 is much weaker than the (80-round) SHA-1, although it has more rounds, and demonstrates that the strength of SHA- 0 is not monotonous in the number of rounds.
Book ChapterDOI
Collisions of SHA-0 and reduced SHA-1
TL;DR: In this paper, the authors describe improvements to the techniques used to cryptanalyze SHA-0 and introduce the first results on SHA-1, including a generic multi-block technique that uses near-collisions in order to find collisions.
Journal Article
Near-collisions of SHA-0
Eli Biham,Rafi Chen +1 more
TL;DR: In this paper, it was shown that up to 142 of the 160 bits of the output are equal in SHA-0, which is a large improvement to the best previous result of 35 rounds.
Journal Article
Collisions of SHA-0 and reduced SHA-1
TL;DR: Improvements to the techniques used to cryptanalyze SHA-0 are described and improvements that allow us to find collisions of reduced versions of SHA-1 are presented, that show that collisions up to about 53–58 rounds can still be found faster than by birthday attacks.
Journal ArticleDOI
Cryptanalysis of SHA-0 and Reduced SHA-1
Eli Biham,Rafi Chen,Antoine Joux +2 more
TL;DR: This work uses new techniques for the cryptanalysis of hash functions to find a collision of the full SHA-0 which is the first published collision of this function, and very efficient collision attacks on reduced versions of SHA-1.