DES加密解密程序的主程序在 FileDES类中

　　运行时使用的例子是本目录下的111.doc文件，运行后自动生成222.doc文件和333.doc文件。

　　其中111.doc文件加密后的文件是222.doc文件，222.doc文件解密后文件是333.doc文件。-DES encryption and decryption process in the main program at run-time type FileDES example is the use of 111.doc catalog files, run files and automatically generate 333.doc file 222.doc. 111.doc document in which the document is encrypted 222.doc document, 222.doc document after the document was declassified documents 333.doc.