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
Creative Commons Attribution
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},
      note = {\url{https://eprint.iacr.org/2016/1170}},
      url = {https://eprint.iacr.org/2016/1170}
}
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