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Volume 26 Issue 1
December  2010
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Bo-Zhan Su, Wen-Ling Wu, Wen-Tao Zhang. Security of the SMS4 Block Cipher Against Differential Cryptanalysis[J]. Journal of Computer Science and Technology, 2011, 26(1): 130-138. DOI: 10.1007/s11390-011-1116-9
Citation: Bo-Zhan Su, Wen-Ling Wu, Wen-Tao Zhang. Security of the SMS4 Block Cipher Against Differential Cryptanalysis[J]. Journal of Computer Science and Technology, 2011, 26(1): 130-138. DOI: 10.1007/s11390-011-1116-9
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Security of the SMS4 Block Cipher Against Differential Cryptanalysis

  • 1. State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing 100190, China;
    2. State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Funds: This work is supported by the National Natural Science Foundation of China under Grant Nos. 60873259 and 60903212, and the Knowledge Innovation Project of the Chinese Academy of Sciences.
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  • Author Bio:

    Bo-Zhan Su received his M.S. degree in maths from Northwest University in 1999. He is currently a Ph.D. candidate of Institute of Software, Chinese Academy of Sciences, and Graduate University of Chinese Academy of Sciences. His current interests include block cipher and hash function.

    Wen-Ling Wu is now a professor and Ph.D. supervisor at the State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences. She received her B.S. degree and M.S. degree in maths from Northwest University in 1987 and 1990, respectively. She received her Ph.D. degree in cryptography from Xidian University in 1997. From 1998 to 1999 she was a postdoctoral fellow in the Institute of Software, Chinese Academy of Science. She is a senior member of China Computer Federation. Her current research interests include theory of cryptography, mode of operation, block cipher, stream cipher and hash function.

    Wen-Tao Zhang is an associate professor at the State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences. Her main interest is block cipher.

  • Received Date: November 21, 2009
  • Revised Date: October 31, 2010
  • Published Date: December 31, 2010
    Abstract
  • SMS4 is a 128-bit block cipher used in the WAPI standard for wireless networks in China. In this paper, we analyze the security of the SMS4 block cipher against differential cryptanalysis. Firstly, we prove three theorems and one corollary that reflect relationships of 5- and 6-round SMS4. Next, by these relationships, we clarify the minimum number of active S-boxes in 6-, 7- and 12-round SMS4 respectively. Finally, based on the above results, we present a family of about 214 differential characteristics for 19-round SMS4, which leads to an attack on 23-round SMS4 with 2118 chosen plaintexts and 2126.7 encryptions.
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    • References (14)
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