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arXiv 1306.4244cs.CRmath.NT
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小特征有限域上离散对数的拟多项式算法

A quasi-polynomial algorithm for discrete logarithm in finite fields of small characteristic

Razvan Barbulescu, Pierrick Gaudry, Antoine Joux, Emmanuel Thomé

摘要:

在目前的工作中,我们提出了一个新的离散对数算法,在相同的静脉在最近的作品Joux,使用渐近更有效的下降方法。主要结果给出了小特征有限域上离散对数问题的拟多项式启发式复杂性。通过准多项式,我们表示$n^{O(\log n)}$类型的复杂度,其中$n$是有限域的基数的位大小。这种复杂度小于用于$ε>0$的任何$L(\varepsilon)$。它在输入的大小上保持超多项式,但与$L(1/4+o(1))$相比提供了重大的渐进改进。

英文摘要:

In the present work, we present a new discrete logarithm algorithm, in the same vein as in recent works by Joux, using an asymptotically more efficient descent approach. The main result gives a quasi-polynomial heuristic complexity for the discrete logarithm problem in finite field of small characteristic. By quasi-polynomial, we mean a complexity of type $n^{O(\log n)}$ where $n$ is the bit-size of the cardinality of the finite field. Such a complexity is smaller than any $L(\varepsilon)$ for $ε>0$. It remains super-polynomial in the size of the input, but offers a major asymptotic improvement compared to $L(1/4+o(1))$.

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