A note on the differential spectrum of a class of locally APN functions

• URL: http://arxiv.org/abs/2501.04233v1
• Date: Wed, 08 Jan 2025 02:17:06 GMT
• Title: A note on the differential spectrum of a class of locally APN functions
• Authors: Haode Yan, Ketong Ren,
• Abstract summary: We first give some properties of the differential spectrum of any cryptographic function. By solving some systems of equations over finite fields, we express the differential spectrum of $f_pm1$ in terms of the quadratic character sums.
• Score: 1.8109081066789852
• License:
• Abstract: Let $\gf_{p^n}$ denote the finite field containing $p^n$ elements, where $n$ is a positive integer and $p$ is a prime. The function $f_u(x)=x^{\frac{p^n+3}{2}}+ux^2$ over $\gf_{p^n}[x]$ with $u\in\gf_{p^n}\setminus\{0,\pm1\}$ was recently studied by Budaghyan and Pal in \cite{Budaghyan2024ArithmetizationorientedAP}, whose differential uniformity is at most $5$ when $p^n\equiv3~(mod~4)$. In this paper, we study the differential uniformity and the differential spectrum of $f_u$ for $u=\pm1$. We first give some properties of the differential spectrum of any cryptographic function. Moreover, by solving some systems of equations over finite fields, we express the differential spectrum of $f_{\pm1}$ in terms of the quadratic character sums.

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