Abstract
Finding new (up to CCZ-equivalence) constructions of APN functions is one of the important but difficult topics in the study of cryptographic functions. Up to now, only 6 infinite families of power APN functions and 14 infinite families of APN polynomials are known. Although the CCZ-equivalence between power APN functions has been completely characterized, a similar theoretical analysis between polynomial APN functions and power APN functions is still missing. In this paper we prove that, in dimension not multiple of 3, a recently introduced family of APN quadrinomials is CCZ-inequivalent to any power APN function. Moreover, we prove that a more general family of APN functions is EA-equivalent to this family.
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Acknowledgements
The authors thank the anonymous reviewers for their valuable suggestions which improved both the quality and the presentation of this paper.
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This work was supported in part by the National Natural Science Foundation of China under Grant 61972258 and by the Scientific Research Fund of Hunan Provincial Education Department under Grant 19B485.
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Shi, C., Peng, J., Zheng, L. et al. On the equivalence between a new family of APN quadrinomials and the power APN functions. Cryptogr. Commun. 15, 351–363 (2023). https://doi.org/10.1007/s12095-022-00606-2
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DOI: https://doi.org/10.1007/s12095-022-00606-2