解密随机数生成器(2)――从java源码看线性同余算法 - Now is better than never - ITeye技术网站



解密随机数生成器(2)――从java源码看线性同余算法 - Now is better than never - ITeye技术网站

上篇博客中,我们了解了基于物理现象的真随机数生成器,然而,真随机数产生速度较慢,为了实际计算需要,计算机中的随机数都是由程序算法,也就是某些公式函数生成的,只不过对于同一随机种子与函数,得到的随机数列是一定的,因此得到的随机数可预测且有周期,不能算是真正的随机数,因此称为伪随机数(Pseudo Random Number)。

 

不过,别看到伪字就瞧不起,这里面也是有学问的,看似几个简简单单的公式可能是前辈们努力了几代的成果,相关的研究可以写好几本书了!顺便提一下,亚裔唯一图灵奖得主姚期智,研究的就是伪随机数生成论(The pseudo random number generating theory)。在这里,我重点介绍两个常用的算法:同余法(Congruential method)和梅森旋转算法(Mersenne twister)


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