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Personal RFID devices-found, e.g., in access cards and contactless credit cards-are vulnerable to unauthorized reading, owner tracking and different types of relay attacks. The authors observe that accessing a personal RFID device fundamentally requires moving it in some manner (e.g., swiping an RFID access card in front of a reader). Determining whether or not the device is in motion can therefore provide enhanced security and privacy; the device will respond only when it is in motion, instead of doing so promiscuously. They investigate extending the concept of min-entropy from the realm of random number generation to achieve motion detection on an RFID device equipped with an accelerometer.
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