Open a Master Lock Without the Combination in 5 to 7 Attempts
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- čas přidán 8. 03. 2019
- Professor Justin Cappos from the New York University Tandon School of Engineering demonstrates how to open a Master Lock without knowing the combination in five to seven attempts. Also, learn the vulnerabilities that allow you to open many other types of locks, including a bike lock and a luggage lock. Video shot and edited by Ted Shaffrey.
2:08 decode a Master lock
9:26 find the 1st number
10:14 find the last number
11:44 find the 2nd number
14:53 decode a 10 push buttons lock
16:03 decode a cheap bicycle lock
17:34 start decoding the cheap bicycle lock
19:20 decode a luggage lock
22:40 open core of the luggage lock
I honestly ran around my house screaming when my lock opened up! Thank you this was so awesome to try and figure out
Nice, thorough explanation. I still can't open mine but your video gives me hope.
Finally! A tutorial on how to do this that isn't just 'I already know the combination, so all I need to do is adjust pressure to make it look right on camera' kind of video. You go into the why and explain well. For reference though, I am a math major so I can see others struggling with the modulo arithmetic, but w/ this I was able to find my old combination so, cheers mate!
I had a bike lock just like that when I was a kid. I thought I was clever when I removed the keeper spring and jumbled the rings to change the combination. My dad gave it a good pull and popped the keeper spring out and the lock opened. So the combination was "give good pull".
This made me very curious about locks and I am still taking them apart to see how they work. Made me a better programmer.
I’ve been trying to unlock my old gym lock for 2 hours now
Same
Same still won't open
Great explanation. I was shocked when I finally got it open, as I didn't expect it to work. 😄
Thank you. I'm waiting on the combo from Master lock, but this worked to solve the lock combo without having to wait. The combo works, so I will get to double check my work once Master lock gets around to replying to my email. Thanks Ted Shaffrey.
Thank you, worked perfectly - of course on the last possible option!
I just unlocked my lock . Thank you so much for the video.
while listening to this scholarly dissertation on modulo 4 math applied to master lock combinations -
i forgot the full sequence for my own master combination lock !
fortunately i was able to reconstruct the full combination with modulo 4 math calculations.
(i hope !)
I wanted to thank you for your video. My lock was really rough and I couldn't decipher Number 1 but could make out number 3 clearly. So I used your rules to create a spreadsheet of possible Number 1 and 2s based on the rules you presented which resulted in 56 possible combinations. It was the 44th one in my list that opened it. I'm stubborn enough to see if I could only open one only feeling the 3rd number and I guess you can. Thanks
THANK YOU for explaining in detail why things work the way they do. Every other video did not help me and seemed to be happenstance that they could unlock it. This made a lot more sense to me and with it I was able to get my childhood lock back open.
I have master lock...and been trying for 7days already....tq...nxt video plss...
Excelente explicación, muchos saludos desde saltillo coahuila MÉXICO.
This video finally made me remember my code combination.
i could only find the first one but did a quick bit of calculating and a good soul read of my lock and figured it out!
I was waiting for your Leatherman to break prying like that. Glad it didn't.
Thanx i saved all my locks i firgit the combos for . Now ill have my locks back
We are trying to open a lock and it has been helpful.
So on my combination lock, the combo's 2nd number is 10 before the first number (which you stated it never would be). And explanation for this? I'm curious. Great video by the way.
You've got it all wrong, officer - I'm an engineering student studying for an exam...
Weird thing: my Dudley combination lock (by Master Lock BTW) has only 1#, not the usual 3#'s, to open it. Turning it to #10 always opens it. The combination card supplied with it only showed#10 as the 1st # to dial, with the 2nd and 3rd spots left blank on the card. Anyone heard of that?
For the Master lock at 13:41 you mention the second digit will never be 2 before or 2 after the last digit. I finally got one I have from high-school unlocked and the last 2 digits were "2" and "4" so I'm not sure that is accurate.
Everything else was super helpful though and I easily found the first and last numbers. I just had to use trial and error for the middle number when the 7-ish options I had didn't work.
What's the physical lesson or manufacturing feature that parallels the mod math's possible solution suggestions?
good question !
undoubtedly has to do with limited possible arrangements of red and yellow disk assembly.
This video is giving me hope to open my lock bc i need my books for class cause i forgot the order of my lock
Except for one major issue...the new Master locks with colored bodies or dials don't work using this format...that's because there are multiple "sticky" points when revolving the dial. Maybe i'm not doing it correctly, but i've tried every instruction video here and none work with the newer model locks. If anyone can comment or help, i'm more than happy to learn how to decode these type locks. Thanks anyway.
A lock only keeps an honest person out. I’ve got bolt cutters that’ll open almost any padlock in 10 seconds. That takes all the skill and fun out of it though. Thanks for making a video that explains how the mechanisms work. There’s too many videos out here that expect one to understand what they should be feeling, looking for, or hearing without any real visual. The cut outs are definitely a plus.
that little nub by the yellow tumbler does in fact serve a purpose. Watch the tumblers when you close the shackle!
Can the remainder be 0?
Thank you so much! no more jail for me :D
Question, you said to find the second number for the combination it must be minus 2 of whichever mod 4 you get… what if it’s 1 mod 4 , or does that never happen?
Then it loops back around to 3
@@sandmaster4444 oh badass! Thank you!!
Somebody stayed up late figuring out how to make the first combination lock. Now you need a PHD in mechanical engineering to open one.
What if the First and Last number don’t have the same remainder????
Bike lock is pi rounded 3.146 (3.14159... )
I just opened one of those locks a couple days ago and those 2 dials are plastic looked a little different inside uhmmm
I need a written explanation of getting the second digit haha toooo confusing there
what happened to the suit ?
The undergrad he's dating saw the first day's recording and told him to lose the suit. She handpicked the replacement. Now he wears nothing but that sweater. He recently wore it to his father's funeral.
Hey Ted Shaffrey
Look at what your “friend” Lincoln posted on CZcams
The "not -2, not -6, not -10" rule for the second number is not correct. I have a lock with N2 = N1 - 10 mod 40.
Also, for the last number, it doesn't hurt if you try multiple combinations. So, the algorithm is:
- Find the first number D with the described method.
- Try as first number A in (D, D-1, D+1)
- For the second number try B in (A+2 mod 40, A+6 mod 40, ... A+38 mod 40)
- For the third number try C in (B - 2 mod 40, B-6 mod 40, B-10 mod 40, ... B - 38 mod 40). For the third number don't re-set A and B. Just set another C and try to pull.
This requires at most 3*10*10=300 pull attempts and at most 3*10=30 setups for the first+second numbers.
As for the first number, let's assume the number is 7. When try to rotate the dial counter-clockwise slowly increasing the pull force. At some pulling force, you'll feel resistance exactly at number 7 and only at that number. If the rotation torque is low when the dial will just stuck no able to move to 6, unless you increase the torque. However, if you increase the pull force, then the dial will stuck earlier, at number 8.
i opened two and more this padlock .. they all have different knots with different distance on the two wheels... not like this video talking about. all the two wheels have exactly measurements. you only find is the last # on the spinning wheel, the open gap is bigger than the the gaps ..
Two hours? Just as long as this video… fell asleep and when I woke up, it still wasn’t over… yawn
LOCKS ARE TO KEEP THE HONEST PPL HONEST!!!
Chapters.. you need chapters so we can skip to the l9ck we are trying to see
Wake me up when he's done.
HAHA
IKR... Should be a sleep therapist
Huh
O
This guy shouldn't be explaining anything lol
No good 😢
Justin Cappos made a porno when he was 19. It was surprisingly good. At least of those statements is not true.
Aj ah uum ah ah ium ; not a guy that can formulate his narrative in real time. Comes across as premature dementia... tip: script what you want to say.
God my five year old Nephew can open this type of lock,
Thanks for telling me about your nephew's accomplishment.
Signed,
God
I'm not sure which one of these comments is more lame...
An Engineering Professor who didn't bother to learn lock terminology. How disappointing. But he's basically right. Lock Hobbyists use these ideas and others to pick locks. It's all about knowing how they are constructed. Keep it legal!
he's trying to teach the general population lol, we wouldn't understand "lock terminology"
@@gfhiphone7216The first part of learning any skill is learning the terminology.
@@scottwilcoxson2439 look, I agree with you and yes he should have proper terminology, but he is teaching beginners. do you expect him to teach them the terminology too? no... most humans are impatient creatures and we just want our answer. maybe somebody just wants to open their locked lock. they will most likely never use this "skill" again. to them the terminology just sounds like useless banter and a reason to watch another comprehensible video...
@@gfhiphone7216 If you appreciate imprecice knowledge that you'll never use again, go for it. I prefer all of it starting with the proper terminology.
@@scottwilcoxson2439 @Scott Wilcoxson I will, but don't criticize him for not since most won't. okay??? this is youtube and most wont take their time to learn the entire thing. they want the epilogue, not the middle
A horrible verbal instruction!
Preach it, Doctor! Hey Dr Carl Simpson can you play Freebird?
Sorry buddy, I fell asleep 😴 when you had the back of the lock open talking about the red and yellow gear, you need to be much more concise and your voice makes me want to close my eyes, wondering if you were a history teacher or other boring subject as a teacher.😴😴😴😴😴😴😴😴😴😴😴😴😴😴
you talk too much !! Bye Bye
You’re just not patient & have a short attention span. If you payed attention and took it step by step you’d be able to figure it out
..I bet you ended up buying a new one too
Boring