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”。
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