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Security and Communication Networks
Volume 2018 (2018), Article ID 5160237, 11 pages
https://doi.org/10.1155/2018/5160237
Research Article

Improved Integral Attacks on SIMON32 and SIMON48 with Dynamic Key-Guessing Techniques

1Key Laboratory of Cryptologic Technology and Information Security, Ministry of Education, Shandong University, Jinan 250100, China
2School of Mathematics, Shandong University, Jinan 250100, China
3Institute for Advanced Study, Tsinghua University, Beijing 100084, China

Correspondence should be addressed to Xiaoyun Wang; nc.ude.auhgnist.liam@gnawnuyoaix

Received 17 July 2017; Accepted 3 January 2018; Published 19 February 2018

Academic Editor: Barbara Masucci

Copyright © 2018 Zhihui Chu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Dynamic key-guessing techniques, which exploit the property of AND operation, could improve the differential and linear cryptanalytic results by reducing the number of guessed subkey bits and lead to good cryptanalytic results for SIMON. They have only been applied in differential and linear attacks as far as we know. In this paper, dynamic key-guessing techniques are first introduced in integral cryptanalysis. According to the features of integral cryptanalysis, we extend dynamic key-guessing techniques and get better integral cryptanalysis results than before. As a result, we present integral attacks on 24-round SIMON32, 24-round SIMON48/72, and 25-round SIMON48/96. In terms of the number of attacked rounds, our attack on SIMON32 is better than any previously known attacks, and our attacks on SIMON48 are the same as the best attacks.