Talk:Substitution-permutation network
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(comment taken from article, added in edit: 22:21, 16 May 2004 . . 213.84.46.114) — Matt 21:24, 16 May 2004 (UTC)
- S-boxes substitute or transform input bits into output bits. A good S-box will have the property that changing one input bit will change about half of the output bits. It will also have the property that each output bit will depend on every input bit. P-boxes permute or transpose bits across S-box inputs. (<- could someone elaborate on that sentence?)