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在用计算机进行数据处理或信息处理工作时,大量的数据或信息的文件的形式存放于磁盘上,其中有许多文件是“透明”的,即对任何用户都是公开的。对于这些“透明”文件,有一些需要妥善加以保护,以免让无关者窃取,修改和删除。为此,人们设计了多种文件加密方法,目的均在于设置障碍,使破译工作不能正常进行,从而达到文件保密的目的。这里,我们介绍两种常用的可行的文件保密方法。
When using a computer for data processing or information processing, a large number of data or information files are stored on a disk, and many of these files are “transparent”, that is, are open to any user. Some of these “transparent” documents need to be properly protected so that no one can steal, modify and delete them. To this end, people designed a variety of file encryption methods, the purpose is to set obstacles, so that the deciphering work can not be carried out, so as to achieve the purpose of document confidentiality. Here, we introduce two commonly used methods of document security.