Further results on permutation pentanomials over ${\mathbb F}_{q^3}$ in characteristic two

TL;DR

This paper extends the characterization of permutation pentanomials over finite fields of characteristic two, providing new insights and techniques to identify permutation properties of specific polynomial classes.

Contribution

It offers new methods to determine permutation properties of pentanomials over ${f F}_{q^3}$, addressing open problems from previous research.

Findings

Characterization of permutation pentanomials with specific exponents

Development of techniques applicable to new classes of permutation polynomials

Progress towards resolving open problems in permutation polynomial classification

Abstract

Let $q=2^m.$ In a recent paper \cite{Zhang3}, Zhang and Zheng investigated several classes of permutation pentanomials of the form $\epsilon_0x^{d_0}+L(\epsilon_{1}x^{d_1}+\epsilon_{2}x^{d_2})$ over ${\mathbb F}_{q^3}~(d_0=1,2,4)$ from some certain linearized polynomial $L(x)$ by using multivariate method and some techniques to determine the number of the solutions of some equations. They proposed an open problem that there are still some permutation pentanomials of that form have not been proven. In this paper, inspired by the idea of \cite{LiKK}, we further characterize the permutation property of the pentanomials with the above form over ${\mathbb F}_{q^3}~(d_0=1,2,4)$. The techniques in this paper would be useful to investigate more new classes of permutation pentanomials.