Description: DES uses a 56 key , as well as 8 additional parity bit , resulting in the largest group size of 64 . This is an iterative block cipher , using called Feistel the technology , which will encrypt the text block in half . Use the sub- key half of the application cycle function , and then the output and the other half of the " exclusive OR " operator then exchange the two halves , this process will continue , but in the end a loop exchange . DES uses 16 cycles , using XOR , replacement , substitution , shift operations are four basic operations
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