Paper 2016/1170
Impossible-Differential and Boomerang Cryptanalysis of Round-Reduced Kiasu-BC
Christoph Dobraunig and Eik List
Abstract
Kiasu-BC is a tweakable block cipher proposed by Jean et al. at ASIACRYPT 2014 alongside their TWEAKEY framework. The cipher is almost identical to the AES-128 except for the tweak, which renders it an attractive primitive for various modes of operation and applications requiring tweakable block ciphers. Therefore, studying how the additional tweak input affects security compared to that of the AES is highly valuable to gain trust in future instantiations. This work proposes impossible-differential and boomerang attacks on eight rounds of Kiasu-BC in the single-key model, using the core idea that the tweak input allows to construct local collisions. While our results do not threat the security of the full-round version, they help concretize the security of Kiasu-BC in the single-key model.
Metadata
- Available format(s)
-
PDF
- Category
- Secret-key cryptography
- Publication info
- Published elsewhere. Major revision. CT-RSA 2017
- DOI
- 10.1007/978-3-319-52153-4_12
- Keywords
- cryptanalysistweakable block cipher
- Contact author(s)
- eik list @ uni-weimar de
- History
- 2016-12-28: received
- Short URL
- https://ia.cr/2016/1170
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2016/1170,
author = {Christoph Dobraunig and Eik List},
title = {Impossible-Differential and Boomerang Cryptanalysis of Round-Reduced Kiasu-{BC}},
howpublished = {Cryptology {ePrint} Archive, Paper 2016/1170},
year = {2016},
doi = {10.1007/978-3-319-52153-4_12},
url = {https://eprint.iacr.org/2016/1170}
}
