DES加密之强制更新下载分离器

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”。

猜你喜欢

转载自www.cnblogs.com/lovesoul/p/9834421.html