2020 | OriginalPaper | Buchkapitel
Cryptanalysis of SKINNY
in the Framework of the SKINNY
2018–2019 Cryptanalysis Competition
verfasst von : Patrick Derbez, Virginie Lallemand, Aleksei Udovenko
Erschienen in: Selected Areas in Cryptography – SAC 2019
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Abstract
SKINNY
cryptanalysis competition, a contest that aimed at motivating the analysis of their recent tweakable block cipher SKINNY
. In contrary to the previous editions, the focus was made on practical attacks: contestants were asked to recover a 128-bit secret key from a given set of \(2^{20}\) plaintext blocks. The suggested SKINNY
instances are 4- to 20-round reduced variants of SKINNY
-64-128 and SKINNY
-128-128. In this paper, we explain how to solve the challenges for 10-round SKINNY
-128-128 and for 12-round SKINNY
-64-128 in time equivalent to roughly \(2^{52}\) simple operations. Both techniques benefit from the highly biased sets of messages that are provided and that actually correspond to the encryption of various books in ECB mode.