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On cross-correlation indicators of an S-box |
Sheng GAO1(), Wenping MA1, Zepeng ZHUO2, Fenghe WANG1 |
1. Key Laboratory of Computer Network and Information Security, Ministry of Education, Xidian University, Xi’an 710071, China; 2. State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an 710071, China |
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Abstract Substitution boxes (S-boxes) are often used as the most important nonlinear components in many symmetric encryption algorithms. The cryptographic properties of an S-box directly affect the security of the whole cipher system. Recently, generalized global avalanche characteristics (GGAC) were introduced to measure the correlation between two arbitrary Boolean functions. In this paper, to better evaluate the security of an S-box, we present two cross-correlation indicators for it. In addition, by studying the related properties of the cross-correlation between two balanced Boolean functions, we propose the lower bounds on the sum-of-squares indicator related to GGAC for two balanced functions and also for an S-box.
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Keywords
cryptography
Boolean functions
substitution boxes
balancedness
generalized global avalanche characteristics
cross-correlation
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Corresponding Author(s):
GAO Sheng,Email:gaosheng@mail.xidian.edu.cn
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Issue Date: 05 December 2011
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