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. (He likened the Master Lock design to a 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.

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. In 2005, he unleashed the, a cross-site scripting exploit that knocked MySpace out of commission when it added more than one million MySpace friends to Kamkar's account.Kamkar told Ars his Master Lock exploit started with a well-known vulnerability that allows. Break open any Master Combo Lock in 8 tries or less!The technique was devised by, a serial hacker who has created everything from to. The following provides a simple tutorial. 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.

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