Kloosterman和与二项式Bent函数的特殊值
Special values of Kloosterman sums and binomial bent functions
摘要:
令$p\ge 7$,$q=p^m$。$K_q(a)=\sum_{x\in \mathbb{F}_{p^m}} ζ^{\mathrm{Tr}^m_1(x^{p^m-2}+ax)}$是$\mathbb{F}_{p^m}$上$a$的Kloosterman和,其中$ζ=e^{\frac{2π\sqrt{-1}}{p}}$。$K_q(a)$及其共轭的值$1-\frac{2}{ζ+ζ^{-1}}$与一类具有Dillon指数的二项式函数有密切的关系。本文首先给出了$a$使得$K_q(a)=1-\frac{2}{ζ+ζ^{-1}}$ .进一步证明了如果$p=11$,对任何$a$,$K_q(a)\neq 1-\frac{2}{ζ+ζ^{-1}}$ .对于$p\ge 13$,如果为$a\in \mathbb{F}_{p^s}$和$s=\mathrm{gcd}(2,m)$,则为$K_q(a)\neq 1-\frac{2}{ζ+ζ^{-1}}$。在应用中,这些结果说明了某些二项式正则Bent函数不存在。
英文摘要:
Let $p\ge 7$, $q=p^m$. $K_q(a)=\sum_{x\in \mathbb{F}_{p^m}} ζ^{\mathrm{Tr}^m_1(x^{p^m-2}+ax)}$ is the Kloosterman sum of $a$ on $\mathbb{F}_{p^m}$, where $ζ=e^{\frac{2π\sqrt{-1}}{p}}$. The value $1-\frac{2}{ζ+ζ^{-1}}$ of $K_q(a)$ and its conjugate have close relationship with a class of binomial function with Dillon exponent. This paper first presents some necessary conditions for $a$ such that $K_q(a)=1-\frac{2}{ζ+ζ^{-1}}$. Further, we prove that if $p=11$, for any $a$, $K_q(a)\neq 1-\frac{2}{ζ+ζ^{-1}}$. And for $p\ge 13$, if $a\in \mathbb{F}_{p^s}$ and $s=\mathrm{gcd}(2,m)$, $K_q(a)\neq 1-\frac{2}{ζ+ζ^{-1}}$. In application, these results explains some class of binomial regular bent functions does not exits.
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