Using C language to write 100 lines of the DES encryption algorithm. DES algorithm has high security, so far, except by exhaustive search attack on the DES algorithm, but also found no more effective way. And 56 long exhaustive key space for the 256, which means that if a computer s speed is detected every second of one million keys, it searches entirely on the needs of key Department of nearly 2285 time can be seen, it is difficult to realize, of course, with the development of science and technology, when the emergence of ultra-high-speed computer, we can consider the DES key length and then some growth in order to achieve higher levels of security.

DES
...\WjcDes.cpp
...\WjcDes.h
...\WjcDesTest.cpp
...\WjcDesTest.dsp
...\WjcDesTest.dsw
...\WjcDesTest.opt

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