2018/11/29-A-关于DES浅谈
数据加密算法(Data Encryption Algorithm,DEA)是一种对称加密算法,很可能是使用最广泛的密钥系统,特别是在保护金融数据的安全中,最初开发的DEA是嵌入硬件中的。DES 使用 16 个循环,使用异或,置换,代换,移位操作四种基本运算。 类似于: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当然,这些都是base64编码。那么,什么是base64呢? Base64是网络上最常见的用于传输8Bit字节代码的编码方式之一,大家可以查看RFC2045~RFC2049,上面有MIME的详细规范。Base64编码可用于在HTTP环境下传递较长的标识信息。例如,在Java Persistence系统Hibernate中,就采用了Base64来将一个较长的唯一标识符(一般为128-bit的UUID)编码为一个字符串,用作HTTP表单和HTTP GET URL中的参数。在其他应用程序中,也常常需要把二进制数据编码为适合放在URL(包括隐藏表单域)中的形式。此时,采用Base64编码不仅比较简短,同时也具有不可读性,即所编码的数据不会被人用肉眼所直接看到。 比如,编写一个“123”,得出的结果就是“MTIz”。
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