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Smartphones with an accelerometer and gyroscope can recognize you by how you walk

The device uses its accelerometer and gyroscope to recognize the pattern of the way you walk, whether you are in sandals, boots, or sneakers. It recognizes your gait from measuring the data received from the gyroscope and accelerometer . It knows how you move and at what pace, and makes a determination of who you are. This would be useful if it is incorporated into a security type app and if your phone gets stolen it would be able to tell it was not the owner walking with the phone and then lock the person out and possibly notify the owner of the location of the device.

http://venturebeat.com/2013/09/12/your-phone-can-recognize-you-by-the-way-you-walk/