Cryptanalysis of FORK-256
Matusiewicz, Krystian, Peyrin, Thomas, Billet, Olivier, Contini, Scott, & Pieprzyk, Josef (2007) Cryptanalysis of FORK-256. Fast Software Encryption, 4593, pp. 19-38.
In this paper we present a cryptanalysis of a new 256-bit hash function, FORK-256, proposed by Hong et al. at FSE 2006. This cryptanalysis is based on some unexpected differentials existing for the step transformation. We show their possible uses in different attack scenarios by giving a 1-bit (resp. 2-bit) near collision attack against the full compression function of FORK-256 running with complexity of 2^125 (resp. 2^120) and with negligible memory, and by exhibiting a 22-bit near pseudo-collision. We also show that we can find collisions for the full compression function with a small amount of memory with complexity not exceeding 2^126.6 hash evaluations. We further show how to reduce this complexity to 2^109.6 hash computations by using 273 memory words. Finally, we show that this attack can be extended with no additional cost to find collisions for the full hash function, i.e. with the predefined IV.
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|Item Type:||Journal Article|
|Additional Information:||An issue of Lecture Notes in Computer Science for the 14th International Workshop, FSE 2007, Luxembourg, Luxembourg, March 26-28, 2007, Revised Selected Papers|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Deposited On:||04 Jul 2014 00:51|
|Last Modified:||07 Jul 2014 02:04|
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