Key Agreement Algorithm for V2I Communication Based on Differential Technique

Sometimes, in spreading messages over wireless channels, vehicle-to-infrastructure (V2I) communication is very prone to spying and improper message modification. Generating secret keys to scramble messages that transmitted over a wireless channel is a promising means of safe V2I communications. Wireless communication is a technology that has been widely used by almost all levels of society, especially in the V2I communication field, of course, this situation raises new problems, namely information security. Therefore, in this paper, a secure communication scheme that is called secret key generation will be carried out by utilizing the uniqueness of the Received Signal Strength (RSS) value on the wireless network. We use differential technique methods to reduce the percentage value of the bit difference. The parameters to be tested in this research are node speeds between 20 km/h, 30 km/h, or 40 km/h and ping intervals between 20 ms, 15 ms, 10 ms. From the experimental results, it can be seen that the percentage value of the bit difference tends to be small in all speed scenarios. Even some scenarios with variations in small fluctuations values have KDR-Q of 0. Overall, it can be said that RSU-1 tends to produce higher KGR-U and more keys when compared to RSU-2. The highest number of keys obtained is 2 with the length of each key is 128 bits.