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Isn't that (almost) 1000? All numbers between 001 and 999?
by skosch 10y ago
Isn't that (almost) 1000? All numbers between 001 and 999?
- adolph 10y agoFor any valid card number yes. I'd bet that almost all don't have three numbers all the same and that there are probably more rules/conventions that would reduce the search space. http://m.wolframalpha.com/input/?i=count+of+permutations+of+3+digits&x=0&y=0 http://m.wolframalpha.com/input/?i=count+of+permutations+of+...
- deleted 10y ago[deleted]
- deleted 10y ago[deleted]
- throwaway2016a 10y agoI had a card one that was three of the same. Obviously an anecdote, though.
- ctrl-j 10y ago> I'd bet that almost all don't have three numbers all the same and that there are probably more rules/conventions that would reduce the search space. You're correct that almost all don't have three identical digits, but that's just because there's only 10 of them - 000, 111, 222, 333, 444, 555, 666, 777, 888, 999 10/1000 = 1% I doubt they would make up rules for determining the cvv, as it would only improve security until bad actors could determine the rules - then it would hinder security as there would be less entropy in the selection space.
- aquadrop 10y agoI think they can be same, but they always > 99 (at least I never saw a card with CVV starting with 0)
- sjtgraham 10y agoIt's 1000, 000 -> 999.