DES uses a 56-bit key and an additional 8-bit parity bit, resulting in the largest 64-bit packet size. This is an iterative block cipher, using the technology known as the Feistel, which will encrypt the text block half. The use of sub-key pair, half of which application circulatory function, and then the output with the other half to " exclusive or" operator followed by the exchange of the two and a half, this process will continue, but in the end a cycle of non-exchange. DES uses 16 cycles.

DES\Cpp1.cpp
...\Cpp1.dsp
...\Cpp1.dsw
...\Cpp1.ncb
...\Cpp1.opt
...\Cpp1.plg
...\Cpp2.cpp
...\Cpp2.dsp
...\Cpp2.dsw
...\Cpp2.ncb
...\Cpp2.opt
...\Cpp2.plg
...\Debug\Cpp1.exe
...\.....\Cpp1.ilk
...\.....\Cpp1.obj
...\.....\Cpp1.pch
...\.....\Cpp1.pdb
...\.....\Cpp2.exe
...\.....\Cpp2.ilk
...\.....\Cpp2.obj
...\.....\Cpp2.pch
...\.....\Cpp2.pdb
...\.....\vc60.idb
...\.....\vc60.pdb
...\DES.pdf
...\DES算法及其VC源代码.doc
...\Debug
DES

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