Using Wireless Link Dynamics to Extract a Secret Key in Vehicular Scenarios

Xiaojun Zhu, Fengyuan Xu, Edmund Novak, Chiu C. Tan, Qun Li, Guihai Chen
2017 IEEE Transactions on Mobile Computing  
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 existing
more » ... ons of key extraction in the indoor or low-speed environments, the unique channel conditions make them inapplicable to vehicular environments. Our scheme effectively and efficiently handles the high noise and mismatch features of the measured samples so that it can be executed in the noisy vehicular environment. We also propose an online parameter learning mechanism to adapt to different channel conditions. Extensive real-world experiments are conducted to validate our solution. Index Terms-Vehicular network, security, privacy, secret key extraction, RSSI, measurement Ç X. Zhu is with the College
doi:10.1109/tmc.2016.2557784 fatcat:fgxji2eydbbzlnw4b2rdbno3qe