One is called尹学渊people who write the DES procedure, the very detailed notes. For those who C++ Not very proficient in person.

Packet : 67506260des1.rar filelist
DES1\DES加密1\vc_des_class.dsp
DES1\DES加密1\vc_des_class.dsw
DES1\DES加密1\vc_des_class.ncb
DES1\DES加密1\yxyDES.cpp
DES1\DES加密1\vc_des_class2.rar
DES1\DES加密1\vc_des_class.plg
DES1\DES加密1\test_main.cpp
DES1\DES加密1\yxyDES.h
DES1\DES加密1\vc_des_class.opt
DES1\DES加密1\Debug
DES1\DES加密1
DES1

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