paper: Privacy Threats through Ultrasonic Side Channels on Mobile Devices

["Dave Farber" <farber () gmail com>]

Begin forwarded message:

> From: Richard Forno <rforno () infowarrior org>
> Date: May 4, 2017 at 11:08:54 AM EDT
> To: Infowarrior List <infowarrior () attrition org>
> Cc: Dave Farber <dave () farber net>
> Subject: paper: Privacy Threats through Ultrasonic Side Channels on Mobile Devices
>
>
> Privacy Threats through Ultrasonic Side Channels on Mobile Devices
>
> Daniel Arp, Erwin Quiring, Christian Wressnegger and Konrad Rieck
>
> Technische Universita ̈t Braunschweig Brunswick, Germany
>
> Abstract—Device tracking is a serious threat to the privacy of users, as it enables spying on their habits and 
> activities. A recent practice embeds ultrasonic beacons in audio 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 different mobile devices. In this paper, we explore the capabilities, the current prevalence and 
> technical limitations of this new tracking tech- nique 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 ultrasonic beacons in 
> TV streams from 7 countries, we spot 234 Android applications that are constantly listening for ultrasonic beacons in 
> the background without the user’s knowledge.
>
> < - >
>
> http://christian.wressnegger.info/content/projects/sidechannels/2017-eurosp.pdf



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