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Re:想问一下，Substitution cipher的意思，是不是任何一个字母，都能换成任意一个其它的字母呢？

Posted by tq at 2005-01-27 16:44:57 on Problem 2159
In Reply To:想问一下，Substitution cipher的意思，是不是任何一个字母，都能换成任意一个其它的字母呢？ Posted by:ioriyagami at 2005-01-27 16:21:11 
Substitution cipher的意思是替代密码,
即对26个字母产生一个对应的表,
但只能是一一对应,不能是多对一或一对多.
明白了吧?
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