JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) ›› 2023, Vol. 58 ›› Issue (3): 85-92.doi: 10.6040/j.issn.1671-9352.0.2022.283

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Block cipher algorithm Eslice based on Feistel structure

LIANG Li-fang1,2, DU Xiao-ni1,2*, LI Kai-bin2,3, XIE Xin1,2, LI Xiao-dan4,5   

  1. 1. College of Mathematics and Statistics, Northwest Normal University, Lanzhou 730070, Gansu, China;
    2. Key Laboratory of Cryptography and Data Analysis, Northwest Normal University, Lanzhou 730070, Gansu, China;
    3. College of Computer Science and Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China;
    4. Trusted Computing and Information Assurance Laboratory, Chinese Academy of Sciences, Beijing 100190, China;
    5. School of Computer Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
  • Online:2023-03-20 Published:2023-03-02

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Abstract: A family of highly secure block cipher algorithms Eslice, including three versions: Eslice-64-64, the block length and key length are both 64 bits; Eslice-64-128, the block length is 64 bits, and the key length is 128 bits; Eslice-128-128, the block length and key length are both 128 bits. Eslices design was inspired by LBlock. The Feistel structure is adopted as a whole, and the SP structure is used for the round function. The selected S-box have all the optimal cryptographic properties. The linear transformation has only two operations: cyclic shift and XOR, and the key generation algorithm and the encryption algorithm use the same S-box. Furthermore, the security of Eslice for differential, linear, integral and other cryptanalysis methods is analyzed. The search model based on Mixed Integer Linear Programming(MILP)are used, and the number of minimum active boxes in 20 rounds is 41, which is 3 less than that of LBlock in 20 rounds. The differential probability and linear deviation are estimated by the number of active boxes, and the security of the algorithm is evaluated. The results show that Eslice can effectively resist differential attack and linear attack.

Key words: block cipher, Feistel structure, security cryptanalysis, S-box

CLC Number: 

  • TN918.4
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