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arXiv 1303.2229math.NT
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有限域上置换多项式的构造

Constructing permutation polynomials over finite fields

Xiaoer Qin, Shaofang Hong

摘要:

本文构造了有限域上几个新的置换多项式。首先,利用线性化多项式,我们构造${\bf F}_{q^{m}}$上形式为$\sum_{i=1}^k(L_{i}(x)+γ_i)h_i(B(x))$的置换多项式,其中$L_i(x)$和$B(x)$是线性化多项式。这推广了Coulter,Henderson和Matthews的一个定理.因此,我们通过构造$x h(λ_{j}(x))$和$xh(μ_{j}(x))$形式的置换多项式推广了Marcos的一个结果,其中$λ_{j}(x)$是$x, x^{q}, ..., x^{q^{m-1}}$和$μ_{j}(x)=\textup{Tr}_{{\bf F}_{q^{m}}/{\bf F}_{q}}(x^{j})$的第$j$阶初等对称多项式.这回答了Zieve在2010年提出的一个开放问题。最后,利用线性变换器,构造了${\bf F}_{q^{m}}$上$L_1(x)+L_{2}(γ)h(f(x))$形式的置换多项式,推广了Kyureghyan的一个结果.

英文摘要:

In this paper, we construct several new permutation polynomials over finite fields. First, using the linearized polynomials, we construct the permutation polynomial of the form $\sum_{i=1}^k(L_{i}(x)+γ_i)h_i(B(x))$ over ${\bf F}_{q^{m}}$, where $L_i(x)$ and $B(x)$ are linearized polynomials. This extends a theorem of Coulter, Henderson and Matthews. Consequently, we generalize a result of Marcos by constructing permutation polynomials of the forms $x h(λ_{j}(x))$ and $xh(μ_{j}(x))$, where $λ_{j}(x)$ is the $j$-th elementary symmetric polynomial of $x, x^{q}, ..., x^{q^{m-1}}$ and $μ_{j}(x)=\textup{Tr}_{{\bf F}_{q^{m}}/{\bf F}_{q}}(x^{j})$. This answers an open problem raised by Zieve in 2010. Finally, by using the linear translator, we construct the permutation polynomial of the form $L_1(x)+L_{2}(γ)h(f(x))$ over ${\bf F}_{q^{m}}$, which extends a result of Kyureghyan.

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