YU Yuyin, WANG Mingsheng, LI Yongqiang. Constructing Differentially 4 Uniform Permutations from Known Ones[J]. Chinese Journal of Electronics, 2013, 22(3): 495-499.
Citation: YU Yuyin, WANG Mingsheng, LI Yongqiang. Constructing Differentially 4 Uniform Permutations from Known Ones[J]. Chinese Journal of Electronics, 2013, 22(3): 495-499.

Constructing Differentially 4 Uniform Permutations from Known Ones

Funds:  This work is supported by the National Natural Science Foundation of China (No.60970134, No.11171323, No.61173134), the IIE's Cryptography Research Project (No.Y2Z0011102), the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDA06010701).
  • Received Date: 2012-04-01
  • Rev Recd Date: 2012-09-01
  • Publish Date: 2013-06-15
  • Low differential uniformity functions provide good resistance to differential attacks. The AES (Advanced encryption standard) uses a differentially 4 uniform function (the inverse function) as its S-box. We give a further study of the inverse function in this paper. It is observed that after exchanging two values of a low differential uniformity function, its differential property still keeps good. Especially, for the inverse function over F2n (n even), various possible differential uniformities are completely determined after its two values are exchanged. As a consequence, we get some highly nonlinear permutations with differential uniformity 4 which are not CCZequivalent (Carlet Charpin-Zinoviev equivalent) to the inverse function on F2n.
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