An In-Vehicle Network Security Protocol Based on Dynamic Encryption

Vehicles are developing toward intelligence and networking, automotive electronic systems are facing more and more attack threats. In view of the multi-functional mixedcriticality characteristics of automotive electronic system, a security protocol for vehicle CAN network based on dynamic encryption is proposed to save system computing resources and reduce the impact on real-time performance. The encryption algorithm level table is designed according to the functional safety level, and the correspondence relationship between the functional criticality, security level and encryption algorithm. Then, we modify the message format and construct a security protocol based on dynamic encryption. In addition, the timing logic of the received messages is judged with the synchronous counter, an anti-replay attack method is represented. Finally, a simple in-vehicle network system is modeled with CANoe, the dynamic encryption mechanism is realized and its effectiveness is verified.