The circle shows the ’privacy zone’ that an athlete can designate. But that is on a street map that shows where the athlete enters that zone. Combine that with the fact that you also know how much distance the athlete has left, and that for multiple running activities (orange, green and blue), and you can easily arrive at 1 concrete point where the athlete probably lives or works.
The circle shows the 'privacy zone' that an athlete can designate. But that is on a street map that shows where the athlete enters that zone. Combine that with the fact that you also know how much distance the athlete has left, and that for multiple running activities (orange, green and blue), and you can easily arrive at 1 concrete point where the athlete probably lives or works. Sports fitness apps, such as Strava, are gaining popularity year after year. They have also often become true social networks. You share very personal data there, and sometimes unknowingly also your home or work location as the starting point of your sports activities. The apps usually allow you to hide those locations, but researchers from the imec-DistriNet research group at KU Leuven discovered that in many cases that option gives a false sense of security.
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