In visual studio 2005 environment, the development of a DES encryption and decryption process, using the C language, can be completed. Txt file encryption and decryption operations, does not support the pdf and other file types. The key is 8 for the character, to start with a letter.

最终加、解密DOS版 不能处理pdf文件 DES_ts_present\debug\DES_ts.exe
................................................\.....\DES_ts.ilk
................................................\.....\DES_ts.pdb
................................................\Desktop.ini
................................................\.ES_ts\a.txt
................................................\......\b.txt
................................................\......\c.pdf
................................................\......\c.txt
................................................\......\data_char_num.c
................................................\......\data_num_char.c
................................................\......\Debug\BuildLog.htm
................................................\......\.....\data_char_bool.obj
................................................\......\.....\DES_main.obj
................................................\......\.....\DES_ts.exe.embed.manifest
................................................\......\.....\DES_ts.exe.embed.manifest.res
................................................\......\.....\DES_ts.exe.intermediate.manifest
................................................\......\.....\func_DES.obj
................................................\......\.....\input_file.obj
................................................\......\.....\mt.dep
................................................\......\.....\output_file.obj
................................................\......\.....\vc80.idb
................................................\......\.....\vc80.pdb
................................................\......\DES_main.c
................................................\......\DES_ts.vcproj
................................................\......\DES_ts.vcproj.MICROSOF-47EF4B.Administrator.user
................................................\......\DES_ts.vcproj.MICROSOF-64D498.Administrator.user
................................................\......\func_DES.c
................................................\......\func_d_DES.c
................................................\......\func_e_DES.c
................................................\......\header.h
................................................\......\input_file.c
................................................\......\L
................................................\......\output_file.c
................................................\......\Release\BuildLog.htm
................................................\......\.......\data_char_num.obj
................................................\......\.......\data_num_char.obj
................................................\......\.......\DES_main.obj
................................................\......\.......\DES_ts.exe.intermediate.manifest
................................................\......\.......\func_DES.obj
................................................\......\.......\input_file.obj
................................................\......\.......\mt.dep
................................................\......\.......\output_file.obj
................................................\......\.......\vc80.idb
................................................\......\.......\vc80.pdb
................................................\DES_ts.ncb
................................................\DES_ts.sln
................................................\DES_ts.suo
................................................\release\DES_ts.exe
................................................\.......\DES_ts.pdb
................................................\DES_ts\Debug
................................................\......\Release
................................................\debug
................................................\DES_ts
................................................\release
最终加、解密DOS版 不能处理pdf文件 DES_ts_present

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