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Extending the GLS endomorphism to speed up GHS Weil descent using Magma
Finite Fields and Their Applications ( IF 1.2 ) Pub Date : 2021-06-15 , DOI: 10.1016/j.ffa.2021.101891
Jesús-Javier Chi-Domínguez , Francisco Rodríguez-Henríquez , Benjamin Smith

Let q=2n, and let E/Fq be a generalized Galbraith–Lin–Scott (GLS) binary curve, with 2 and (,n)=1. We show that the GLS endomorphism on E/Fq induces an efficient endomorphism on the Jacobian JacH(Fq) of the genus-g hyperelliptic curve H corresponding to the image of the GHS Weil-descent attack applied to E/Fq, and that this endomorphism yields a factor-n speedup when using standard index-calculus procedures for solving the Discrete Logarithm Problem (DLP) on JacH(Fq). Our analysis is backed up by the explicit computation of a discrete logarithm defined on a prime-order subgroup of a GLS elliptic curve over the field F2531. A Magma implementation of our algorithm finds the aforementioned discrete logarithm in about 1,035 CPU-days.



中文翻译:

使用 Magma 扩展 GLS 内同态以加速 GHS Weil 下降

q=2n, 然后让 /Fq 是广义的加尔布雷思-林-斯科特(GLS)二元曲线,其中 2(,n)=1. 我们证明了 GLS 上的自同态/Fq 在雅可比矩阵上引入有效的内同态 杰克H(Fq)属- g超椭圆曲线H 对应于应用于 GHS Weil-descent 攻击的图像 /Fq之中,这自同态产生一个因子Ñ使用标准指标演算程序求解离散对数问题(DLP)时加速杰克H(Fq). 我们的分析得到了在域上 GLS 椭圆曲线的素数阶子群上定义的离散对数的显式计算的支持F2531. 我们算法的 Magma 实现发现上述离散对数约为1,035 CPU-天。

更新日期:2021-06-15
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