Tracking People Without GPS
Schneier on Security
DECEMBER 15, 2017
Interesting research : The trick in accurately tracking a person with this method is finding out what kind of activity they're performing. Whether they're walking, driving a car, or riding in a train or airplane, it's pretty easy to figure out when you know what you're looking for. The sensors can determine how fast a person is traveling and what kind of movements they make. Moving at a slow pace in one direction indicates walking.
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