Someone is able to explain to me the construction and operation of the DES S-Box, which from n input bits input, produces an output of m bits, with m <n?

I found some material, but I can't understand it:

http://it.wikipedia.org/wiki/S-Box

http://en.wikipedia.org/wiki/DES_supplementary_material

Thanks in advance for your answers.

I found some material, but I can't understand it:

http://it.wikipedia.org/wiki/S-Box

http://en.wikipedia.org/wiki/DES_supplementary_material

Thanks in advance for your answers.

Last edited on

cross posted

http://cboard.cprogramming.com/c-programming/151827-des-s-box.html

Also here: http://forums.devshed.com/c-programming-42/reproduce-an-s-box-933181.html

http://cboard.cprogramming.com/c-programming/151827-des-s-box.html

Also here: http://forums.devshed.com/c-programming-42/reproduce-an-s-box-933181.html

Last edited on

If it isn't cross-posting, can someone remove "meganewbie" messages?

Then, can somebody explain me this part of the algorithm?

Thanks to all.

Then, can somebody explain me this part of the algorithm?

Thanks to all.

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