Feb 23, 2012 They found that the odds of cracking a lost card's four-digit pin are just under 10 percent if you've been foolish enough to select "a really dumb.... 4 digit code cracker. Photo via YouTube If you have an iPhone you're required to use a minimum of four characters in your passcode, though you can set your.... Our results show that a 4-digit PIN can be cracked in less than 0.3 sec on an old Pentium III 450MHz computer, and in 0.06 sec on a Pentium IV 3Ghz HT computer. df76b833ed h