des algorithm source code for DES algorithm of the symmetric cryptosystem cryptosystem, was to become the United States Data Encryption Standard, is the United States in 1972 developed by IBM Corporation symmetric encryption algorithm cryptosystem. Its key length 56, 64 explicitly grouped according to specific sub-group and after the 56-bit key by an alternative method or exchange group formed ciphertext encryption methods. DES encryption algorithm characteristics: short packet, the key is too short, short life-cycle password, slower speed of operation.

Des.cpp
schedle.h
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