Abstract:

In V2X direct communication, vehicles continuously send their own position coordinate during driving, and roadside communication equipment continuously broadcast the road map coordinate information, but there is a lack of coordinate information protection measures in V2X direct communication protocols, so the vehicle’s travelling trajectory and the regional map information can be easily accessed by external parties, which poses a potential security risk to the national geographic information security. Two format-preserving encryption algorithms based on the Feistel structure and the hash algorithm were proposed to realize the encryption of coordinate information. Experimental results show that the two encryption algorithms proposed can meet the coordinate encoding requirement of V2X protocol. The encryption and decryption performance meet the requirements of practical applications, and the delay is negligible.

Key words: V2X, coordinate, format-preserving, linear congruence