Abstract:
The paper is concerned with combinatorial description of almost perfect nonlinear functions (APN-functions). A complete characterization of n-place APN-functions in terms of (n−1)-place subfunctions is obtained. An n-place function is shown to be an APN-function if and only if each of its (n−1)-place subfunctions is either an APN-function or has the differential uniformity 4 and the admissibility conditions hold. A detailed characterization of 2, 3 or 4-place APN-functions is presented.
This research was carried out with the financial support of the Russian Foundation for Basic Research (grant no. 15-07-01328) and the Programme of Support of Leading Scientific Schools of the President of the Russian Federation (grant no. NSh-1939.2014.1).
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