双向加密

加密，是以某种特殊的算法改变原有的信息数据，使得未授权的用户即使获得了已加密的信息，但因不知解密的方法，仍然无法了解信息的内容。大体上分为双向加密和单向加密，而双向加密又分为对称加密和非对称加密(有些资料将加密直接分为对称加密和非对称加密)。?

双向加密大体意思就是明文加密后形成密文，可以通过算法还原成明文。而单向加密只是对信息进行了摘要计算，不能通过算法生成明文，单向加密从严格意思上说不能算是加密的一种，应该算是摘要算法吧。具体区分可以参考：

(一)、对称加密

采用单钥密码系统的加密方法，同一个密钥可以同时用作信息的加密和解密，这种加密方法称为对称加密，也称为单密钥加密。?
需要对加密和解密使用相同密钥的加密算法。由于其速度，对称性加密通常在消息发送方需要加密大量数据时使用。对称性加密也称为密钥加密。?
所谓对称，就是采用这种加密方法的双方使用方式用同样的密钥进行加密和解密。密钥是控制加密及解密过程的指令。?

算法是一组规则，规定如何进行加密和解密。因此对称式加密本身不是安全的。
常用的对称加密有：DES、IDEA、RC2、RC4、SKIPJACK、RC5、AES算法等?
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此加密方式至今不能明白是怎么组合的，请能解码的博友尽快联系博主！！