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I know that Data Encryption Standard (DES) provide strong security but I want to know how does it provides confusion and diffusion?

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closed as too broad by tylerl, Noordung, Adnan, Gilles, Lucas Kauffman Nov 7 '13 at 20:03

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

    
DES and strong security in one sentence, funny. –  Lucas Kauffman Nov 7 '13 at 20:03

1 Answer 1

Confusion and diffusion aren't attributes provided by DES, but rather the building blocks of creating a cipher like DES. In the case of DES, the confusion step is the S-box substitution, while the diffusion step is where the output of the S-boxes is rearranged according to the P-box permutation rules.

See Wikipedia: DES for the actual details.

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