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I think this needs some documentation that the terminology of "P-box" is real and widely accepted. I'm a cryptographer, and I've never heard of this term. The entry cites reference , but reference  doesn't exist. I suspect this is a personal nomenclature that is not widely used, or something made up, or a typo for S-box. Also, the entry seems to have factual errors or confusions. It claims that it "retains diffusion" (whatever that means), but a permutation (re-ordering) of the bits cannot provide any diffusion. Overall, I think this entry should be deleted. — Preceding unsigned comment added by 18.104.22.168 (talk) 20:10, 7 January 2013 (UTC)
Bruce Schneier's Applied Cryptography uses the term in its discussion of DES and related Feistel ciphers. A little googling around convinces me that lots of others use it in this context as well. Ntsimp (talk) 23:29, 7 January 2013 (UTC)