置换只不过是一个简单的换位，每个置换都可以用一个置换矩阵Ek来表示。每个置换都有一个与之对应的逆置换Dk。
密码学中，由替代密码和置换密码结合使用而构成的一种密码。
In cryptography, a cipher produced by a composition of a number of substitution and transposition ciphers.
置换密码是一种简单的加密技术，采用这项技术将把字母表中的每个字母替换为字母表中的其他字母。
A substitution cypher is a simple encryption technique where every letter of the alphabet is substituted with another letter from the alphabet.
但是简单的置换密码玩起来很有趣，尤其是在RPG环境中给某个人传递一条可以在玩游戏的过程中破解出来的编码信息。
But simple substitution cyphers can be fun to play with, especially in an RPG context by handing someone an encoded message that they can work out during game play.
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