[9.1、简单的字符串加密、解密函数](9.1%E3%80%81%E7%AE%80%E5%8D%95%E7%9A%84%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%8A%A0%E5%AF%86%E3%80%81%E8%A7%A3%E5%AF%86%E5%87%BD%E6%95%B0.md) [9.2、简单的加密解密类](9.2%E3%80%81%E7%AE%80%E5%8D%95%E7%9A%84%E5%8A%A0%E5%AF%86%E8%A7%A3%E5%AF%86%E7%B1%BB.md) [9.3、简单对称加密算法2](9.3%E3%80%81%E7%AE%80%E5%8D%95%E5%AF%B9%E7%A7%B0%E5%8A%A0%E5%AF%86%E7%AE%97%E6%B3%952.md) [9.4、常用对称加密算法（DES/AES）类](9.4%E3%80%81%E5%B8%B8%E7%94%A8%E5%AF%B9%E7%A7%B0%E5%8A%A0%E5%AF%86%E7%AE%97%E6%B3%95%EF%BC%88DES-AES%EF%BC%89%E7%B1%BB.md) [9.5、3des加密解密类-三重数据加密算法](9.5%E3%80%813des%E5%8A%A0%E5%AF%86%E8%A7%A3%E5%AF%86%E7%B1%BB-%E4%B8%89%E9%87%8D%E6%95%B0%E6%8D%AE%E5%8A%A0%E5%AF%86%E7%AE%97%E6%B3%95.md)