[Resource Topic] 2020/363: On equivalence between known polynomial APN functions and power APN functions

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Title:
On equivalence between known polynomial APN functions and power APN functions

Authors: Qianhong Wan, Longjiang Qu, Chao Li

Abstract:

Constructions and equivalence of APN functions play a significant role in the research of cryptographic functions. On finite fields of characteristic 2, 6 families of power APN functions and 14 families of polynomial APN functions have been constructed in the literature. However, the study on the equivalence among the aforementioned APN functions is rather limited to the equivalence in the power APN functions. Meanwhile, the theoretical analysis on the equivalence between the polynomial APN functions and the power APN functions, as well as the equivalence in the polynomial APN functions themselves, is far less studied. In this paper, we give the theoretical analysis on the inequivalence in 8 known families of polynomial APN functions and power APN functions.

ePrint: https://eprint.iacr.org/2020/363

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