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Securing a wireless channel between any two vehicles is a crucial component of vehicular networks security. This can be done by using a secret key to encrypt the messages. We propose a scheme to allow two cars to extract a shared secret from RSSI (Received Signal Strength Indicator) values in such a way that nearby cars cannot obtain the same key. The key is informationtheoretically secure, i.e., it is secure against an adversary with unlimited computing power. Although there are existingdoi:10.1109/tmc.2016.2557784 fatcat:fgxji2eydbbzlnw4b2rdbno3qe