GPSKey: GPS based Secret Key Establishment for Intra-Vehicle Environment

In order to overcome such limitations, context-based pairing schemes, where they extract secret key from common observations (e.g., visual channel [29], ambient audio [9], [14], timing of detected events [11], wireless signal strength [12], [33] and wireless channel interference [19], [22]) without requiring human interactions are proposed. However, these schemes present two shortcomings: (1) The surrounding environment may not consistently provide enough randomness for effective key generations. For example, [11] requires a user to generate additional events to reduce pairing time. (2) Some channels may not available in a normal vehicle. For example, audio signals in a vehicle can be easily interfered with by noises and vibrations.