Security News > 2015 > June > Tracking People By Smart Phone Accelerometers (Schneier on Security)

Interesting research: "We Can Track You If You Take the Metro: Tracking Metro Riders Using Accelerometers on Smartphones": Abstract: Motion sensors (e.g., accelerometers) on smartphones have been demonstrated to be a powerful side channel for attackers to spy on users' inputs on touchscreen. In this paper, we reveal another motion accelerometer-based attack which is particularly serious: when a person takes...

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https://www.schneier.com/blog/archives/2015/06/tracking_people_4.html