# Master lock combination calculator

With three numbers ranging from 0 to 39 there are 64, possible combinations and attempting to brute force a solution at 10 seconds per try could take 22 days of non-stop testing.

With this technique it will take only 15 minutes without any experience. This procedure was designed for Master Lock brand combination locks new and old. A combination of is the same as or This makes Master Lock combination recovery a lot easier.

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In one complete turn of the dial you should have 12 numbers recorded. Of the remaining 5 the last number in the combination is the whole number with the unique ending. For example, with my test lock I listed the following numbers: 38, Select the number you found in Step 2 into the Combination Calculator. It will calculate all the possible combinations, 64 in total, much fewer than 64, and it usually takes, on average, only 32 tries to find the correct combination.

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All the files are back online. Thank you very much for taking the time to let me know. Thank you! It has a xxx serial number on the back. This finally worked. Interestingly, some of the other methods HAD correctly identified the last number, but first number was never correctly identified. It worked. Add me to the list.

Common numbers had an ending of 4, leaving the last number in the combination. Nearly went through the whole combination chart. Yet, Pop! Thanks for the procedure. I have an older master lock and the dial only goes up to Can you help?

Ok, tried from the ComboCalculator and it opens the lock. My guess is that is most likely the Factory Combo. The 12 points were: 2. Tried the formula method which has opened several MasterLocks in the past, but a lock I found does not match the formula. Lock is Ser xx series and had to shim it open. I was also able to open it using Thank you for sharing the procedure of master lock combination recovery.

These guidelines will help anyone to recover the combination to a combination lock. I knew the last digit of my combination — The calculator worked brilliantly — I had my lock open in about 3 minutes! All my daughter could remember is that the combo had a low number in the middle. After looking at different tutorials, I kept coming up with 36 as the last number.

The possibles table was a great tool.We use cookies on this website. We use these cookies to enhance your user experience, improve the quality of our site, and to show you marketing that is more likely to be relevant to your interests. We also allow third parties, including our advertising partners, to place cookies on our websites. By continuing to use this website, you consent to the placement and use of cookies as described in our Privacy Policy.

At Master Lock, the health and safety of our associates is always a priority. To set the combination on a Set-Your-Own combination padlock model,orfollow these steps:. Here are the instructions on how to reset the combination on your backpack lock which is pre-set at the factory to open to combination :. Here are the instructions for changing the combination on your model D lock. This lock is preset at the factory to operate at Here are the instructions for changing the combination on your model DWD lock.

This lock is preset at the factory to operate at P-L-A-Y. Here are the instructions for changing the combination on you model D lock. Note: Once the lock is set, there is no way to open it without the combination.

Please make sure you record your NEW combination in a safe place. Store your combination at www. Please make sure you record your new combination in a safe place. To set the combination on the model Set-Your-Own combination Pro-Sport lock, follow these steps:. To set the combination on the model and Set-Your-Own combination bike lock, follow these steps:.

Accept Accept. Q: How do I set or reset the combination on a Set-Your-Own combination padlock model, or ?

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A: To set the combination on a Set-Your-Own combination padlock model,orfollow these steps: Open lock with the factory set or previously set combination. The lock must be set to the current combination, or you cannot reset it. Note: the shackle must be in the open position to reset the combination.

Insert reset tool enclosed in package in hole on side of lock.Here's an experience I, and most high school students go through at some point in their life. You wake up in the middle of the night, and remember that you need a padlock for P.

You quickly rummage through all the junk in your room, and find about five of them, but you have no clue what the combination is for any of them. You look on the Master Lock website, and there's a two-month process you can go through to get the combination.

You look on youtube and all you can find is a guy with a weird equation that only narrows it down to combinations, which could still take up hours of your time. This instructable will show you how to find the combination to a master lock.

This is only to be used in an emergency where you need to open the lock. You should never use it to break into someone else's gym locker.

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Besides, there's nothing in there but smelly, sweaty gym clothes, and maybe a stick of deodorant. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. Find the newest looking padlock you have. This will work with most master locks, but probably not the really old ones.

CRACK ANY COMBINATION MASTERLOCK! feat. Magic Murray

Turn the lock so the back side is facing up. Pry up the edges around the back using the screwdriver. It is only important for you to pry up the bottom half of the circle of edges.

Once you have at least the bottom half of the edge circle pried up, you should be able to slide the back panel off, so it looks like it does in the picture. There should be a circular hole like in the middle of the picture where you can see the edge of a circular metal disk. If your lock by chance does not have one, you can try another lock that might, or attempt to drill a hole. Clear the lock by spinning the dial clockwise a few times.

Once it is cleared, look through the hole in the back. Rotate the dial clockwise until you see a notch in the metal disk inside the hole, like in the picture. Then, look at what number the arrow on the front of the lock is pointing to. That is the first number in your combination. Write it down. Now look through the hole in the back again. Through the notch in the metal disk, you should be able to see another metal disk. Turn the dial counter-clockwise until you see a notch in that disk as well, that lines up with the first one you found.During these challenging times, we guarantee we will work tirelessly to support you.

We will continue to give you accurate and timely information throughout the crisis, and we will deliver on our mission — to help everyone in the world learn how to do anything — no matter what. Thank you to our community and to all of our readers who are working to aid others in this time of crisis, and to all of those who are making personal sacrifices for the good of their communities.

We will get through this together. Updated: April 9, References. If you don't know the combination to a Master Lock [1] X Research source combination lock, you have a few options.

If your lock is attached to something, you can break the lock, call a locksmith or use a shim. However, these options could put a dent in your wallet.

### Lost Combinations FAQs

Sometimes, your cheapest option is to figure out the combination. To crack a Master Lock combination lock, download a lost combination form on the Master Lock website. Then, fill out the form and pay to have it notarized. Once you've completed the form, mail it to the Master Lock warehouse along with a photo of the lock and the lock's serial number. After about weeks, you should receive the combination to the lock in the mail. To learn how to crack a Master Lock without the serial number, keep reading!

If you forget the combination and can't find where you stored the information sheet that came with the lock, you have a couple of options. You can either send the lock to Master Lock and wait several weeks to get the lock and its combination back from the company, or you can figure it out with a bit of detective work. Move the Master lock's numbered dial clockwise; spin the zero past the indicator arrow for three consecutive passes.

On the fourth pass, leave the zero under the arrow. Pull the shackle clasp up, which will make the dial stick and somewhat difficult to move. While you pull the shackle clasp up, start moving the dial clockwise until it stops and won't spin around any further. The dial will stick at every three or four consecutive numbers before you won't be able to move it anymore.

Take note of what number is under the arrow at this time. Release the shackle clasp.

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Pull the shackle clasp back up and spin the dial counterclockwise until it stops. The distance from the first clockwise spin stopping point number to the second counterclockwise spin stopping point number is the range of the third number or last digit of your combination.

Write "third number range" down on the top line of your scrap paper. For example, if the dial stops between 3 and 4, write down "3. If they are two numbers apart, let's say 16 and 18, record the middle number, which in this case is Let go of the shackle clasp to move past the stopping point of the dial.

Spin the dial clockwise three times past zero and stop on the zero on your fourth spin. Find the clockwise spin stopping point and the counterclockwise spin stopping point range and write down the number. Repeat this process until your range of numbers has gone all the way around the dial to zero. You should have a list of 12 range numbers at this time.

Examine your list of 12 numbers. Write an X over any number that ends in a 0. Look at the remaining range numbers. Four of the numbers will end with the same number in their single digit or one's column.There's a vulnerability in Master Lock branded padlocks that allows anyone to learn the combination in eight or fewer tries, a process that requires less than two minutes and a minimal amount of skill to carry out.

The exploit involves lifting up a locked shackle with one hand while turning the combination dial counterclockwise starting at the number 0 with the other.

Before the dial reaches 11, there will be three points where the dial will resist being turned anymore.

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One of them will be ignored as it is exactly between two whole numbers on the dial. The remaining two locations represent locked positions. Next, an attacker again lifts the locked shackle, this time with less force, while turning the dial clockwise.

At some point before a full revolution is completed, the dial will resist being turned. An attacker can still turn through it but will physically feel the resistance. This location represents the resistance location. The two locked positions and the one resistance position are then recorded on a Web page that streamlines the exploit. The page responds with the first digit of the combination and two possible digits for the last digit. By testing which of the possible last digits has more "give," an attacker can quickly figure out which one is correct.

By eliminating the false digit from the Web form, the page will automatically populate the eight possible numbers for the second digit of the combination. Now that the attacker knows the first and last digits and knows the second digit is one of eight possible numbers, the hack is a simple matter of trying each possible combination until the correct one opens the lock.

The following video provides a simple tutorial.

## Permutation and Combination Calculator

Inhe unleashed the Samy worma cross-site scripting exploit that knocked MySpace out of commission when it added more than one million MySpace friends to Kamkar's account. He then physically broke open a combination lock and noticed the resistance he observed was caused by two lock parts that touched in a way that revealed important clues about the combination. He likened the Master Lock design to a side channel in cryptographic devices that can be exploited to obtain the secret key.

Kamkar then made a third observation that was instrumental to his Master Lock exploit: the first and third digit of the combination, when divided by four, always return the same remainder. By combining the insights from all three weaknesses he devised the attack laid out in the video. It's by no means the only way to break the security of a popular padlock.

It comes a few years after Master Lock engineers developed new padlocks that resisted a popular form of attacks using shims made from soft drink cans. Kamkar said he has tried his exploit on more than a dozen Master Lock combination locks, and so far it has worked on all of them. In the coming weeks, he plans to unveil more details, including an Arduino-based robot that streamlines the exploit.

You must login or create an account to comment. Skip to main content Thegreenj. Further Reading Ars puts new Master Lock hack to the test—and succeeds. Here is the actual algorithm that the site uses to predict numbers in the combination.

Irrelevant portions have been removed. Video and demonstration of what's literally happening inside the lock forthcoming! After looking at the algorithm, it seems his main innovation is the calculation of the first number via the resistant location rotate 5 from resistant.

He also has a nice trick for calculating the 3rd number more quickly, but the 3rd number is actually the only "certain" number in the try method, so this is not too important. Combining those two methods would give you 10 tries. There is also a known correlary to the try method that allows you to eliminate 2 of the 10 second numbers, because they cannot be "next to" the 3rd number.

This leaves you with 8 tries.We use cookies on this website. We use these cookies to enhance your user experience, improve the quality of our site, and to show you marketing that is more likely to be relevant to your interests. We also allow third parties, including our advertising partners, to place cookies on our websites. By continuing to use this website, you consent to the placement and use of cookies as described in our Privacy Policy. At Master Lock, the health and safety of our associates is always a priority.

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