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README.md

移位变换算法的实现

加解密原理:

$ c=E_{k}(m) \equiv m+k \pmod{26} ,0\le m,k\le 25 $
$ m=D_{k}(c) \equiv c-k \pmod{26} ,0\le c, k\le 25 $

字母与数字的对应:

a b c d e f g h i j k l m
0 1 2 3 4 5 6 7 8 9 10 11 12
n o p q r s t u v w x y z
13 14 15 16 17 18 19 20 21 22 23 24 25

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移位变换加解密算法 spread retract
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