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。通常,自动取款机(Automated Teller Machine,ATM)都使用DEA。它出自IBM的研究工作,IBM也曾对它拥有几年的专利权,但是在1983年已到期后,处于公有范围中,允许在特定条件下可以免除专利使用费而使用。1977年被美国政府正式采纳。 DES的原始思想可以参照二战德国的恩格玛机,其基本思想大致相同。传统的密码加密都是由古代的循环移位思想而来,恩格玛机在这个基础之上进行了扩散模糊。但是本质原理都是一样的。现代DES在二进制级别做着同样的事:替代模糊,增加分析的难度。 DES的加密原理,是使用一个 56 位的密钥以及附加的 8 位奇偶校验位,产生最大 64 位的分组大小。这是一个迭代的分组密码,使用称为 Feistel 的技术,其中将加密的文本块分成两半。使用子密钥对其中一半应用循环功能,然后将输出与另一半进行“异或”运算;接着交换这两半,这一过程会继续下去,但最后一个循环不交换。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”。

转载于:https://www.cnblogs.com/lovesoul/p/11445874.html

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