This 3D printing robot can open the password lock within 30 seconds.

Password lock seems to be very safe? Maybe it used to be, but now you have to be careful! This is because a robot made by 3D printing can open your password lock in half a minute.

On Thursday, well-known hacker Samy Kamkar posted a 3D printing blueprint and related code for a robot called "Combo Breaker" on his website. The robot is Based on Arduino design. Just put it on the visible Master Lock lock, and through a vulnerability discovered by Kamkar, the Combo Breaker can open the lock in as little as 5 minutes without human intervention.

Combo Breaker's built-in code makes it possible to unlock not only violent means. Last month, Kamkar announced a mathematical technique that would allow anyone to open a low-end Master Lock lock in just 8 attempts. The successful implementation of this technique benefits from a product defect: when the rotor is rotated, if the U-shaped hook is pulled, it will encounter a certain resistance in a certain number, which will help the unlocker to recognize the position of the "password plate". To achieve the purpose of unlocking. Kamkar implemented this technique through a web-based tool and was confirmed by many people.

Combo Breaker further automates these techniques so that anyone without experience can also perform unlocking. And with the help of humans, just use the above method to determine what the first resistance figure is, Combo Breaker can get the password lock in 30 seconds. “Without any intervention, Combo Breaker can do 80 combinations of attempts to unlock it,” explains Kamkar. “If you can help determine the first number in manual mode, the device only needs to try up to 8 times.”

The Combo Breaker is very simple in construction. It consists of a stepper motor, an Arduino chip for running the unlocking algorithm, a lever that pulls the hook, and a 3D printed fastener to help the product stick in front of the lock and an optical sensor. Track the numbers on the dial. According to Kamkar, the cost of all these parts adds up to no more than $100. A video to build the entire device will be attached later.

Kamkar said that the lock manufacturer would not be surprised by his discovery. Master Lock marks the security level of the lock on the product's outer packaging with a number from 1 to 10. The product he tested has a security rating of 3. “Obviously, if you really have something very important to protect, you definitely need a lock with a corresponding level of security,” Kamkar said.

In fact, similar methods have been known for many years, and what Kamkar did was to reduce 64,000 attempts to 100. However, after the initial goal was achieved, through practice, Kamkar further simplified the entire process and significantly reduced the unlocking time.

The Combo Breaker robot is just one of Camcar's many whimsy, and he has been working as an independent software developer and consultant. In 2005, after the creation of the "Sami worm", Kamkar became famous. This "worm" spreads like a virus to the entire Myspace social network, attracting more than 1 million new friends for Sami's space in less than 24 hours. Camcar's latest work includes: a drone that hijacks other drones wirelessly and a browser cookie called "evercookie" that can't be removed.

The purpose of Kamkar to create and publish the Combo Breaker robot is basically to experiment and entertain himself. He calls it a tool similar to the "James Bond" style. However, he also hopes that the public will be aware of the risks of low-end password locks. “Security personnel know this, but the public is not aware of it,” Kamkar said. “I hope to attract the attention of the public by creating interesting things, and then let them be more fully aware of the risks of these locks in order to make more accurate trade-offs.”

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