You'd probably set a chron with crack or John the Ripper which would come with a small password list and do some common permutations and then lock accounts. Ars

You'd probably set a chron with crack or John the Ripper which would come with a small password list and do some common permutations and then lock accounts. Ars Technica mentioned a RockYou.com password list that is now the go to list for serious cracking. I think it would be hard to enforce this patent for sysadmins who implement their own system.