DES algorithm implementation and improvement, DES uses a 56 bit key and an additional 8-bit parity, the greatest 64-bit block size. This is an iterative block cipher, using the technology known as Feistel, which will encrypt the text block into two halves. Half of them using the application of the key sub-circulatory function, and then the other half of the output with a " XOR" operation then swap the two and a half, this process will continue, but no exchange of the last cycle. DES uses 16 cycles, using XOR, replacement, substitution, shift operations are four basic operations. Data Encryption Algorithm

DES\Debug\DES加解密算法.bsc
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...\DES加解密算法.APS
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DES

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