Using Ultrasonic Beacons to Track Users

I've previously written about ad networks using ultrasonic communications to jump from one device to another. The idea is for devices like televisions to play ultrasonic codes in advertisements and for nearby smartphones to detect them. This way the two devices can be linked. Creepy, yes. And als...

Ultrasonic Beacons Are Tracking Your Every Movement

More than 200 Android mobile applications listen surreptitiously for ultrasonic beacons embedded in audio that are used to track users and serve them with targeted advertising. Academics from Technische Universitat Braunschweig in Germany recently published a paper in which they describe their...