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零点小说网 > 科幻小说 > 致暗频率 > 正文 第24章 四重奏

正文 第24章 四重奏(第3页/共4页)

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遗憾的是该检验方法消耗的计算机内存过大,无法上机实用。只能停留在论文层面。

目前,应用于军事、通讯、金融的密码,底层的素性检验程序使用的是概率检验法。

比较流行的算法是基于米勒-拉宾检验的复合算法。

由于费马伪素数数量太多了,不能仅使用费马小定理进行素性检验用于加密。

巴希尔的介绍让哈米德昏昏欲睡,他连忙收住话头,指着那个奇怪的网名说:

“作为数论研究,有些数学爱好者仍然利用费马检验,探寻整数的极为有趣的性质。比如我曾经看到过一个有意思的猜想。”巴希尔接着说:

“对任意整数n从二进制到log?n向下取整进位制,进行费马检验,能够通过检验的伪素数除卡迈克尔数之外,必有na+12a+1的形式。”

“有爱好者在互联网发帖,公布了264以内的47个伪素数,均满足上述猜想。”

“其中最小的n24201763332120111000401x22000801。”

“这47个数的两个因子都是素数吗?”罗珊娜好奇地问道。

“你说到关键了,按照猜想,a+1可以是素数也可以是合数。如果我没记错,其中46个数都只有两个素因子,只有一个n的 a+1是三因子合数,2a+1是个素数,这个n是由四个素因子组成的合数。”

罗珊娜终于听明白了,问道:

“四重奏指的是四个素因子?对于小于264所有整数进行费马检验,进位制从2至log n,能通过检验的非卡迈克尔数的伪素数只有一个四因子合数。这个满足条件的最小的四因子合数到底是哪个数呀?”

巴希尔打开自己的电脑,从收藏夹中找到了包含47个数的表格,把那个唯一的四因子伪素数抄在了黑板上:

n168562580058457201103x307x9181x580624801

其中, a+1103x307x9181290312401。

“这就是log?n-费马检验的四重奏!”巴希尔得意地说道。

哈米德赞许地看着巴希尔问道:

“你们给那个凯兹回复的内容就是这四个数字,对吧?”

巴希尔点头表示认可,罗珊娜若有所思地说道:

“回复这四个数字仅仅是解开了他出的谜题,为了使聊天进行下去,我们也需要起一个自带谜题的网名,考考他。”

“这个有意思。”巴希尔将网名输入栏空着,在下面输入了聊天内容: 『加入书签,方便阅读』
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