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 , and let be a generalized Galbraith–Lin–Scott (GLS) binary curve, with and . We show that the GLS endomorphism on induces an efficient endomorphism on the Jacobian of the genus-g hyperelliptic curve corresponding to the image of the GHS Weil-descent attack applied to , and that this endomorphism yields a factor-n speedup when using standard index-calculus procedures for solving the Discrete Logarithm Problem (DLP) on . 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 . A Magma implementation of our algorithm finds the aforementioned discrete logarithm in about CPU-days.
中文翻译:
使用 Magma 扩展 GLS 内同态以加速 GHS Weil 下降
让 , 然后让 是广义的加尔布雷思-林-斯科特(GLS)二元曲线,其中 和 . 我们证明了 GLS 上的自同态 在雅可比矩阵上引入有效的内同态 属- g超椭圆曲线 对应于应用于 GHS Weil-descent 攻击的图像 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. 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. 我们算法的 Magma 实现发现上述离散对数约为 CPU-天。