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Improved multi-dimensional meet-in-the-middle cryptanalysis of KATAN. (English) Zbl 1436.94089
Summary: We study multidimensional meet-in-the-middle attacks on the KATAN block cipher family. Several improvements to the basic attacks are explained. The most noteworthy of these is the technique of guessing only non-linearly involved key bits, which reduces the search space by a significant factor. The optimization decreases the complexity of multidimensional meet-in-the-middle attacks, allowing more rounds of KATAN to be efficiently attacked than previously reported.

MSC:
94A60 Cryptography
Software:
KATAN; KTANTAN
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