Impossible-differential and boomerang cryptanalysis of round-reduced Kiasu-BC
C Dobraunig, E List - Topics in Cryptology–CT-RSA 2017: The …, 2017 - Springer
Topics in Cryptology–CT-RSA 2017: The Cryptographers' Track at the RSA …, 2017•Springer
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 …
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 …
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.
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