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可逆的加密算法，要求有点高

WBOY
Release： 2016-06-13 12:41:17
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求一个可逆的加密算法，要求有点高
要求：
1.加密后的长度和加密前的长度一样长
2.加密后的字符串中只允许出现a到z中的字母和0到9的数字
3.根据秘钥可以再算回来
加密前的字符串也都是字母和数字的组合
如加密前的字符串:us3kqvu

Related labels：
us3kqvu
source：php.cn
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