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Wireless networks are being integrated into the modern automobile. The security and privacy implications of such in-car networks, however, are not well understood as their transmissions propagate beyond the confines of a car's body. To understand the risks associated with these wireless systems, this paper presents a privacy and security evaluation of wireless Tire Pressure Monitoring Systems using both laboratory experiments with isolated tire pressure sensor modules and experiments with a complete vehicle system. The authors show that eavesdropping is easily possible at a distance of roughly 40m from a passing vehicle.
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