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Largest Study of its Kind Shows Outdated Password Practices are Widespread
(www.cc.gatech.edu)
This is a most excellent place for technology news and articles.
Either you or I got wooshed, cause I thought that was a maths joke, not actually an answer.
If your password is onky made up of numbers and there's no or a faulty anti-replay feature, you can just keep tryinguntil you iterate to the right password.
People used to do it with 4 digit PINs