DES uses a 56 bit key and an additional 8 bit parity bit (n = eighth as the parity bit), the largest 64 bit packet size. This is a block cipher an iterative, using a technology called Feistel, which will be encrypted text block into two halves. For one half of application of circular functions using the sub key, then the output of the "exclusive or" operation and the other half then exchange the two halves, this process will continue, but at the end of a cycle does not exchange. DES uses 16 cycles, using XOR, replacement, replacement, shift operation of four basic operations.

DES.txt

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