Subway riders' smartphones could carry tracking malware

Millions of city dwellers with smartphones in hand, pocket or bag, use trains to get around night and day, seven days a week. The incoming message from three researchers in China is that an attacker could track them based on information from a phone's accelerometer. The three, from Nanjing University, have completed a study which went up on the arXiv server earlier this month. "We Can Track You If You Take the Metro: Tracking Metro Riders Using Accelerometers on Smartphones" describes the attack.

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