There is a really fascinating discussion about this on Bruce Schneier's blog (http://www.schneier.com/blog/archives/2012/04/amazing_round_o.html http://www.schn

There is a really fascinating discussion about this on Bruce Schneier's blog (http://www.schneier.com/blog/archives/2012/04/amazing_round_o.html http://www.schneier.com/blog/archives/2012/04/amazing_round_...). Btw, if you're interested in security and encryption, Bruce's blog is a must read