If you don’t trust wearable devices, then you weren’t being paranoid as new research proved how smartwatches and fitness trackers, which are recording your movements, can be exploited by attackers to steal your ATM PIN or password.

Yan Wang, an assistant professor of computer science at the Thomas J. Watson School of Engineering and Applied Science at Binghamton University, won’t wear a smart watch. “It knows too much,” he told IEEE Spectrum.

Wang should know as he was one of five researchers who developed a technique which combined data from embedded sensors in wearables with an algorithm; it could crack PINS and passwords with an 80% accuracy in just one try. After three tries, they achieved a 90% accuracy.

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