Integral Cryptanalysis on Reduced-round KASUMI
2018 International Symposium on Information Theory and Its Applications (ISITA)(2022)
摘要
Integral cryptanalysis is one of the most powerful attacks on symmetric key block ciphers. Attackers preliminarily search integral characteristics of a target cipher and use them for an attack. Todo proposed a novel technique named the bit-based division property to find integral characteristics. Xiang et al. extended Mixed Integer Linear Programming (MILP) method to search integral characteristics of lightweight block ciphers based on the bit-based division property. In this paper, we apply these techniques to the symmetric key block cipher KASUMI which was developed by modifying MISTY1. As a result, we found new 4.5-round characteristics of KASUMI for the first time. We show that 7-round KASUMI is attackable with 2(63) data and 2(120) encryptions.
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关键词
block cipher, integral cryptanalysis, bit-based division property, KASUMI
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