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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Sheng Gao received his BSc in mathematics from Taiyuan Normal University in 2005 and his MSc in mathematics from Qinghai Normal University in 2008. Now he is a PhD candidate at Xidian University. His current research interests include cryptography, information security, cloud computing and cloud security.
Wenping Ma is Professor and PhD supervisor at Xidian University. He obtained his BSc and MSc in mathematics from Shanxi Normal University in 1987 and 1990, and the PhD in Communication and Information Systems from the School of Communication Engineering, Xidian University in 1999. His main research interests include coding theory, cryptography, and information theory.
Zepeng Zhuo received his BSc and MSc in mathematics from Huaibei Coal Industry Normal College in 2004 and 2007, respectively. Now he is a PhD candidate at Xidian University. His current research interests include cryptography and information theory.
Fenghe Wang received his BSc in mathematics from Yantai Normal University in 2001 and his MSc in cryptography from Xidian University in 2006. Now he is a PhD candidate at Xidian University. His current research interests include lattice public key cryptography and digital signatures.
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Gao, S., Ma, W., Zhuo, Z. et al. On cross-correlation indicators of an S-box. Front. Comput. Sci. China 5, 448–453 (2011). https://doi.org/10.1007/s11704-011-0177-9
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DOI: https://doi.org/10.1007/s11704-011-0177-9