The gym here has these "heavy-duty theft-resistant" locks they let you use to lock lockers (amazing concept, huh?). I was playing with one of them today. It's a basic combination lock—single dial that goes from 0 to 39, 3-number combination (X, Y, Z), and the following steps to open:
When step 5 is done the lock opens.
The first problem is that if you replace step 4 with
the lock still opens when step 5 is done. In my case Z and Y were "34" and "0" respectively, so it's not like they were close together....
The second problem is that the lock makes a nice loud click when Z is reached in step 4 (which admittedly makes the first problem rather academic).
I have to admit that these look more difficult to saw through than typical high-school locker locks, but from a pure codebreaking standpoint they are much easier to open (only about 400 possible combinations, since there is no need to guess Z; on a lock on which all three numbers need to be guessed there are more like 8000 combinations).Posted by bzbarsky at February 3, 2004 10:49 PM