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Article text states 56-bit keys (which I believe is correct) whereas the diagram states that there are 64 bits in the key (which I believe is wrong). They should agree with each other, and (this would be helpful) both be right... JulesH13:16, 26 January 2007 (UTC)[reply]
I believe the diagram is correct. The cipher is specified to accept a 64-bit key, but 8 of those bits are simply ignored by PC1, so it has an effective key size of only 56 bits. — Matt Crypto14:46, 26 January 2007 (UTC)[reply]
What's the "worldwide" tag for? I don't think key schedules are a nation- or culture-dependent subject. The article could be expanded, but I think it's fairly universal. Ntsimp (talk) 14:35, 13 July 2008 (UTC)[reply]
Well, that tag was added by the same anon user that added the "It is requested that a photograph or photographs be included in this article to improve its quality" tag to lots of crypto algorithm talk pages like this one. I think we can simply revert his tagging since he seems to not know what he is doing.