QT achieve DES encryption, a symmetric encryption algorithm, DES uses a 56-bit key and an additional eight parity bits, resulting in the largest packet size 64. This is an iterative block cipher, using the technique called Feistel, wherein the encrypted text block divided into two halves. Half of them using the sub-key application circulatory function, then the output and the other half for " exclusive or" operation Then swap the two halves, this process will continue, but in the end a cycle is not exchanged. DES uses 16 cycles, using XOR, replacement, substitution, four basic arithmetic shift operations.

DES\debug\des.o
...\.....\main.o
...\.....\testAES.exe
...\des.cpp
...\des.h
...\DES.pro
...\DES.pro.user
...\main.cpp
...\Makefile
...\Makefile.Debug
...\Makefile.Release
...\debug
...\release
DES

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