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arXiv 1507.01495math.NT
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关于特征固定的有限域上的离散对数问题

On the discrete logarithm problem in finite fields of fixed characteristic

Robert Granger, Thorsten Kleinjung, Jens Zumbrägel

摘要:

对于素数幂的$q$,$\mathbb{F}_{q}$中的离散对数问题(DLP)在于,对于任何$g \in \mathbb{F}_{q}^{\times}$和$h \in \langle g \rangle$,找到整数$x$,使得$g^x = h$。我们提出了一个算法计算离散型方程,我们证明了,对于每个素数$p$存在无穷多个显式的扩展域$\mathbb{F}_{p^n}$,其中的DLP可以解决预期的准多项式时间。此外,受到一个猜想的存在不可约多项式的某种形式,该算法解决了DLP在所有扩展$\mathbb{F}_{p^n}$在预期的准多项式时间。

英文摘要:

For $q$ a prime power, the discrete logarithm problem (DLP) in $\mathbb{F}_{q}$ consists in finding, for any $g \in \mathbb{F}_{q}^{\times}$ and $h \in \langle g \rangle$, an integer $x$ such that $g^x = h$. We present an algorithm for computing discrete logarithms with which we prove that for each prime $p$ there exist infinitely many explicit extension fields $\mathbb{F}_{p^n}$ in which the DLP can be solved in expected quasi-polynomial time. Furthermore, subject to a conjecture on the existence of irreducible polynomials of a certain form, the algorithm solves the DLP in all extensions $\mathbb{F}_{p^n}$ in expected quasi-polynomial time.

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