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How Android Apps are Using Ultra Sound to Track Users
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An alarming discovery by Brunswick Technical University researchers in Germany has been made regarding the use of ultrasonic tracking beacons in Android applications to track users and their surroundings. The research paper emphasised on the technology of ultrasound cross-device tracking (uXDT) which has become famous in the past three years. 

uXDT is a method that is used by advertisers through ads which hide ultrasounds. The moment the ad runs on a radio or TV, or some ad code on a computer or mobile, there are ultrasounds emitted which the microphone of the nearby device picks.

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