Impossible-Differential and Boomerang Cryptanalysis of Round-Reduced Kiasu-BC

Christoph Erwin Dobraunig*, Eik List

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


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.
Original languageEnglish
Title of host publicationTopics in Cryptology -- CT-RSA 2017
EditorsHelena Handschuh
Number of pages16
Publication statusPublished - 2017
EventTopics in Cryptology - The Cryptographer's Track at the RSA Conference 2017: CT-RSA 2017 - San Francisco, United States
Duration: 14 Feb 201717 Feb 2017

Publication series

NameLecture Notes in Computer Science


ConferenceTopics in Cryptology - The Cryptographer's Track at the RSA Conference 2017
Abbreviated titleCT-RSA 2017
Country/TerritoryUnited States
CitySan Francisco
Internet address

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