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Sensors in your phone that collect seemingly harmless data could leave you vulnerable to cyber attack, according to new research. And saying no to apps that ask for your location is not enough to prevent the tracking of your device. A new study has found evidence that accelerometers—which sense motion in your smartphone and are used for applications from pedometers to gaming—leave “unique, trackable fingerprints” that can be used to identify you and monitor your phone. Here’s how it works, according to University of Illinois electrical and computer engineering professor Romit Roy Choudhury and his team: Tiny imperfections during the manufacturing process make a unique fingerprint on your accelerometer data. The researchers compared it to cutting out sugar cookies with a cookie cutter—they may look the same, but each one is slightly, imperceptibly different. More