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- W4246456492 abstract "In this paper, a new method for constructing a Mixed Integer Linear Programming (MILP) model on conditional differential cryptanalysis of the nonlinear feedback shift register- (NLFSR-) based block ciphers is proposed, and an approach to detecting the bit with a strongly biased difference is provided. The model is successfully applied to the block cipher KATAN32 in the single-key scenario, resulting in practical key-recovery attacks covering more rounds than the previous. In particular, we present two distinguishers for 79 and 81 out of 254 rounds of KATAN32. Based on the 81-round distinguisher, we recover 11 equivalent key bits of 98-round KATAN32 and 13 equivalent key bits of 99-round KATAN32. The time complexity is less than <math xmlns=http://www.w3.org/1998/Math/MathML id=M1> <msup> <mrow> <mn>2</mn> </mrow> <mrow> <mn>31</mn> </mrow> </msup> </math> encryptions of 98-round KATAN32 and less than <math xmlns=http://www.w3.org/1998/Math/MathML id=M2> <msup> <mrow> <mn>2</mn> </mrow> <mrow> <mn>33</mn> </mrow> </msup> </math> encryptions of 99-round KATAN32, respectively. Thus far, our results are the best known practical key-recovery attacks for the round-reduced variants of KATAN32 regarding the number of rounds and the time complexity. All the results are verified experimentally." @default.
- W4246456492 created "2022-05-12" @default.
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- W4246456492 date "2020-11-23" @default.
- W4246456492 modified "2023-10-14" @default.
- W4246456492 title "Improved Conditional Differential Analysis on NLFSR-Based Block Cipher KATAN32 with MILP" @default.
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- W4246456492 doi "https://doi.org/10.1155/2020/8883557" @default.
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