Zero-correlation linear cryptanalysis of reduced-round LBlock |
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Authors: | Hadi Soleimany Kaisa Nyberg |
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Institution: | 1. Department of Information and Computer Science, Aalto University School of Science, P.O. Box 15400, 00076?, Aalto, Finland
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Abstract: | Zero-correlation linear attack is a new method developed by Bogdanov et al. (ASIACRYPT 2012. LNCS, Springer, Berlin, 2012) for the cryptanalysis of block ciphers. In this paper we adapt the matrix method to find zero-correlation linear approximations. Then we present several zero-correlation linear approximations for 14 rounds of LBlock and describe a cryptanalysis for a reduced 22-round version of LBlock. After biclique attacks on LBlock revealed weaknesses in its key schedule, its designers presented a new version of the cipher with a revised key schedule. The attack presented in this paper does not exploit the structure of the key schedule or S-boxes used in the cipher. As a result, it is applicable to both variants of the LBlock as well as the block ciphers with analogous structures like TWINE. Moreover, we performed simulations on a small variant LBlock and present the first experimental results on the theoretical model of the multidimensional zero-correlation linear cryptanalysis method. |
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