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This article cites a bunch of papers from ieee xplore (in the further reading section I mean). These are not accessible without a subscription. So it would be nice to have some alternative sources. —Preceding unsigned comment added by 18.104.22.168 (talk) 21:11, 11 February 2011 (UTC)
There are only 2 such, out of a list that is probably too long given the tiny stub-state of this article. Ntsimp (talk) 21:22, 11 February 2011 (UTC)
Does really impossible mean with probability 0? I believed that impossible meant cannot occur, which is (strictly) stronger than having a probability 0. Sedrikov (talk) 14:42, 10 July 2013 (UTC)
The block ciphers considered here are finite algorithms, with finitely many possible inputs and outputs. With a finite sample space, probability 0 is the same as literally impossible. Ntsimp (talk) 20:08, 11 July 2013 (UTC)