Paper 2009/526
Improved Related-Key Boomerang Attacks on Round-Reduced Threefish-512
Jiazhe Chen and Keting Jia
Abstract
Hash function Skein is one of the 14 NIST SHA-3 second
round candidates. Threefish is a tweakable block cipher as the core
of Skein, defined with a 256-, 512-, and 1024-bit block size. The
512-bit block size is the primary proposal of the authors. Skein had
been updated after it entered the second round, the only differences
between the original and the new version are the rotation constants.
In this paper we construct related-key boomerang distinguishers on
round-reduced Threefish-512 based on the new rotation constants
using the method of \emph{modular differential}. With these
distinguishers, we mount related-key boomerang key recovery attacks
on Threefish-512 reduced to 32, 33 and 34 rounds. The attack on
32-round Threefish-512 has time complexity
Note: new results are added
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- Threefish-512related-key boomerang attackmodular differential
- Contact author(s)
- jiazhechen @ mail sdu edu cn
- History
- 2010-02-20: last of 3 revisions
- 2009-11-02: received
- See all versions
- Short URL
- https://ia.cr/2009/526
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2009/526, author = {Jiazhe Chen and Keting Jia}, title = {Improved Related-Key Boomerang Attacks on Round-Reduced Threefish-512}, howpublished = {Cryptology {ePrint} Archive, Paper 2009/526}, year = {2009}, url = {https://eprint.iacr.org/2009/526} }