第二种方法就是运用离散对数的概念。要掌握这些概念首先需要了解乘法群的概念。
The second approach is to use the concept of discrete logarithm. Understanding this concept requires understanding some properties of multiplicative groups.
辛矩阵只能在乘法群下保辛，故传递辛矩阵的保辛摄动必须采用正则变换的乘法。
The symplectic conservative perturbation for a transfer symplectic matrix should be based on the canonical transformation method.
由于求解该离散对数的难度与求解乘法群上的离散对数的难度相同，所以在椭圆曲线上可构造出相对安全的密码系统。
Because computing the discrete logarithm more difficulty than the discrete logarithm over multiplication group, so it is possible to construct quite safe cryptosystem.
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