DES algorithm in symmetric key cryptography system, also known as the United States Data Encryption Standard, was developed in 1972, the United States, IBM' s symmetric cipher encryption algorithm. The key length is 56 bits, 64 bits are grouped according plain text, plaintext after the packet and 56-bit bit key by the formation of alternative methods or exchange the encryption cipher group.

DES加密算法源码\quickdes.cpp
...............\quickdes.h
DES加密算法源码

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