Interesting, but doesn't it seem rather ridiculous? Using this turkey's method, you would not be able to crack lots of combinations, for example, 1-1-20.

The thing is, there aren't 40^3 combinations. The markings on the dial are just aesthetic. The locking mechanism only has 10 positions, hence 10^3 combinations. 1-1-20 isnt a combo that this masterlock could have. Also, they have "dummy" notches cut in the drive wheel that this guy's algorithm identifies, they used to not have any dummy notches, just the last digit was the notch btw. This method would absolutely work for any combination that this lock COULD have. Masterlock has addressed this issue in certain new locks, but its a problem that still remains in ALOT of their combo locks.

Man that's a lot of math to deal with. As soon as I get a hold of a math tutor, I'm going to go down to my old junior high and get my old bike off the bike rack since I forgot the combo.

Hey, this video stops at 5:20, I can't see the last bit of it. Does anyone else have this prob?

dw1117: Just use a cutter? [grin]

A few questions.

1) Did he screw up at 5:05 and get the wrong remainders? 3 & 4 when it should have been 2 & 3?

2) What is a 'master' lock? Is that a type of lock, or just a manufacturer?

3) What it narrated by Christopher Walken?!

Mai haed hrutsss!!!!! AHHHH!!!

Combination locks are not just queer, they are queerer than we can suppose.

Yes, his math is wrong. The remainder 0,1,2,3 probably maps to 2,3,0,1 (R+2 mod 4) but given that simple math error the rest seems less trustworthy. Also, given that the wheel only has 10 positions, there are 10*10*10 = 1000 possible combinations, not 64000. So this is a method for finding the last digit and the wheel positions, reducing the complexity by a factor of 10 not 640. Still cool though.

BTW Mooseman, mine plays to 6:59 but I downloaded it.

I've read about this before. I have an old Master Lock that this doesn't work on. It only locks on one number. Years ago at my flight school, someone stuck a Master Lock on my flight instructor's locker. I printed out the instructions and we eventually figured it out.

This is all takes too long to do. I think it's faster to break the lock.

Most of these old Masterlocks can be opened in seconds (without damaging the lock) using an easy-to-manufacture shim. No math required.

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