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Arp, D., Quiring, E., Wressnegger, C., & Rieck, K. (2016). Bat in the mobile: A study on ultrasonic device tracking. (Computer Science Report) No. 2016–02. Institute of System Security, Technische Universität Braunschweig. 
Added by: Mark Grimshaw-Aagaard (12/6/23, 6:50 PM)   
Resource type: Report/Documentation
Language: en: English
BibTeX citation key: Arp2016
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Categories: General
Keywords: Ultrasound
Creators: Arp, Quiring, Rieck, Wressnegger
Publisher: Institute of System Security, Technische Universität Braunschweig
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"Users are nowadays exposed to a large number of tracking techniques. An emerging practice embeds inaudible beacons in sound and tracks them using the microphone of mobile devices. This side channel allows an adversary to identify a user’s current location, spy on her TV viewing habits or link together her di erent mobile devices. A comprehensive user profile is the result.
    In this paper, we explore the capabilities, the current prevalence and technical limitations of this new tracking technique based on three commercial tracking solutions. To this end, we develop detection approaches for ultrasonic beacons and Android applications capable of processing these. Our findings confirm our privacy concerns: We spot ultrasonic beacons in various web media content and detect signals in 4 of 35 stores in two European cities that are used for location tracking. While we do not find inaudible beacons in TV streams from 7 countries, we spot 223 Android applications that are constantly listening for ultrasonic beacons in the background without the user’s knowledge."
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