Forgot your Master lock combo? Or want some incentive to not use a Master padlock? There’s a website for that.

• Cracking Master Lock Combination Locks 2017
• How To Crack A Master Lock Combination
• Cracking Master Lock Combination Locks Tool
• Open A Master Combination Lock

The video above from Samy Kamar shows how you can crack any Master combination lock within eight tries. It’s a bit long, but here’s Ars Technica’s explanation if you don’t want to sit through the video:

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. 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.

Aug 30, 2018  A combination lock is a useful way of securing a cupboard or box and keeping important items safe. However, if you forget the combination, it can be extremely difficult to gain access to your belongings. Luckily, there are ways to unlock a combination lock without knowing the combination. Oct 06, 2009  Long, long ago we covered a method to crack a Master lock in about 30 minutes or less. Here’s a revival of the same method but now the instructions to retrieve the combination are in info. Mar 12, 2017  They did not seem to have key locks so I took a combination lock to simply slow down any attempt to access my locker. Break open any Master Combo Lock in 8 tries or less. May 05, 2015  Easily Cracking a Master Combination Lock. Kamkar told Ars his Master Lock exploit started with a well-known vulnerability that allows Master Lock combinations to be cracked in 100 or fewer tries.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. Lock picking is a great skill that takes lots of practice and patience to master, but some locks simply can't be picked, like a Master Lock combination padlock. With a combination lock, you'll have to do it the old-fashioned way—cracking combinations. Nov 23, 2015  Some Master Locks require additional or different procedures to crack as they use different combination algorithms. The model number of your Master Lock can be found on the back of the lock. If by chance your lock’s model number begins with 800 or 908, this method of combination cracking may not work.

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We’ve previously seen an illustrated guide to cracking a Master lock, but the online tool makes it much easier and in many fewer tries.

Crack a Master Combination Padlock Redux

Cracking Master Lock Combination Locks 2017

Two years ago we highlighted how to crack a Master combination padlock for those of you who may…

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How To Crack A Master Lock Combination

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Break open any Master Combo Lock in 8 tries or less! YouTube via Ars Technica