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不是,随便一个置换就可以,可以参考代数结构!

Posted by davydc at 2006-02-18 20:35:12 on Problem 2159
In Reply To:permutation cipher 是只有这个<2, 1, 5, 4, 3, 7, 6, 10, 9, 8>这个么？？如果超过10个的话该怎么交换呢？ Posted by:quanjianan at 2006-02-18 09:06:28 
> Permutation cipher applies some permutation to the letters of the message. For example, applying the permutation <2, 1, 5, 4, 3, 7, 6, 10, 9, 8> to the message "VICTORIOUS" one gets the message "IVOTCIRSUO".
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