Improved multi-dimensional meet-in-the-middle cryptanalysis of KATAN.

*(English)*Zbl 1436.94089Summary: 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 |

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\textit{S. Rasoolzadeh} and \textit{H. Raddum}, Tatra Mt. Math. Publ. 67, 149--166 (2016; Zbl 1436.94089)

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