Talking Behind Your Back (33c3)

On the Privacy Security of the Ultrasound Tracking Ecosystem In the last two years, the marketing industry started to show a fast increasing interest in technologies for user crossdevice tracking, proximity tracking, and their derivative monetization schemes. To meet these demands, a new ultrasoundbased technology has recently emerged and is already utilized in a number of different realworld applications. Ultrasound tracking comes with a numb