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Your phones Bluetooth signal can be tracked, even when unpaired

It is now possible to uniquely identify and track mobile devices using Bluetooth Low Energy signals emitted 500 times per minute.

Published Jun 10, 2022 4:44 AM CDT   |   Updated Sun, Jul 3 2022 10:20 PM CDT

A paper on the Bluetooth signal tracking titled "Evaluating Physical-Layer BLE Location Tracking Attacks on Mobile Devices" was recently presented at the IEEE Security & Privacy conference in Oakland, California, on May 24th, 2022.

Your phones Bluetooth signal can be tracked, even when unpaired 01 |

Researchers from the University of California San Diego have found Bluetooth Low Energy (BLE) signals are constantly emitted by mobile devices, generating a unique fingerprint that attackers can use to track an individual's movements. This covers smartphones, smartwatches, and fitness trackers, all of which transmit roughly 500 "Bluetooth beacons" per minute.

The unique fingerprint results from minute manufacturing imperfections in device hardware, which uniquely distorts the Bluetooth signal, allowing attackers to bypass anti-tracking techniques like constantly changing network addresses. Across their experiments, they found that 40%-47% of devices were uniquely identifiable and could track a volunteer as they left their residence.

"This is important because in today's world Bluetooth poses a more significant threat as it is a frequent and constant wireless signal emitted from all our personal mobile devices," said Nishant Bhaskar, a Ph.D. student in the UC San Diego Department of Computer Science and Engineering and one of the paper's lead authors.

"As far as we know, the only thing that definitely stops Bluetooth beacons is turning off your phone," said Bhaskar.

You can read more from the study here.

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Adam grew up watching his dad play Turok 2 and Age of Empires on a PC in his computer room, and learned a love for video games through him. Adam was always working with computers, which helped build his natural affinity for working with them, leading to him building his own at 14, after taking apart and tinkering with other old computers and tech lying around. Adam has always been very interested in STEM subjects, and is always trying to learn more about the world and the way it works.

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