Hackers Can Guess Your PIN Just Using The Motion Sensor On Your Phone

It's not just your PIN, passwords too.
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So here’s some worrying news: Hackers can actually find out your PIN and passwords just by analysing the way you tilt a phone in your hand.

The revelation comes from cyber experts at Newcastle University who say they’ve developed a technique which allows them to easily monitor the motion sensors on smartphones and tablets.

By detecting the movement of a device while the keyboard is being used the team say they were able to crack a four-digit PIN with 70% accuracy on the first guess and then with 100% accuracy by the fifth.

Wachiwit via Getty Images

Lead author Dr Maryam Mehrnezhad, a research fellow in the School of Computing Science, said: “Most smartphones, tablets, and other wearables are now equipped with a multitude of sensors, from the well-known GPS, camera and microphone to instruments such as the gyroscope, rotation sensors and accelerometer.

“But because mobile apps and websites don’t need to ask permission to access most of them, malicious programs can covertly ‘listen in’ on your sensor data and use it to discover a wide range of sensitive information about you such as phone call timing, physical activities and even your touch actions, PINs and passwords.”

Because there is no uniform way of managing sensors across the industry, the research points towards there being a real threat to personal security.

Yet despite these findings the authors believe that many of the major companies involved have yet to find a way to tackle this problem, even though they’re fully aware that they exist.

After publishing the findings today in the International Journal of Information Security, the team is now looking at the additional risks posed by personal fitness trackers which are linked to online profiles.

Dr Mehrnezhad said: “More worryingly on some browsers we found that if you open a page on your phone or tablet which hosts one of these malicious codes and then open, for example, your online banking account without closing the previous tab, then they can spy on every personal detail you enter.

“And worse still, in some cases, unless you close them down completely, they can even spy on you when your phone is locked.

“Despite the very real risks, when we asked people which sensors they were most concerned about we found a direct correlation between perceived risk and understanding.

“So people were far more concerned about the camera and GPS than they were about the silent sensors.”

The team was able to identify 25 different sensors which came as standard on most smart devices and were used to give different information about the device and its user.

The researchers found that each user touch action – clicking, scrolling, holding and tapping – induced a unique orientation and motion trace and so on a known webpage, the team was able to determine what part of the page the user was clicking on and what they were typing.

They said they had alerted all the major browser providers such as Google and Apple of the risks but so far no-one has been able to come up with an answer.

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