Performance Analysis for Secure Communication Based on CMAC

The most vehicle manufacturers have been using the CAN (Controller Area Network) in order to communicate among ECUs in vehicle systems for a long time. However, CAN has a disadvantage in that it cannot send and receive large amounts of data quickly due to its limited speed and short data transmission size. The CAN FD (Controller Area Network with Flexible Data rate) was developed to compensate for this disadvantage, and it has the advantage of being able to communicate at more fast speed and eight times the data transmission size compared to CAN. These CAN and CAN FD are vulnerable to message replay attacks because they do not provide data authentication. In this paper, secure communication is implemented by applying CMAC (Cipher based Message Authentication Code) based on CAN and CAN FD. Also, the performance of the two secure communications is compared and analyzed. To implement CMAC, HW-based AES-128 (Advanced Encryption Standard) CBC (Cipher Block Chaining) algorithm is used. This paper compares the performance of Secure CAN and CAN FD communication based on CMAC and can help to check communication traffic of ECU (Electronic Control Unit) in advance when applying the function in the real vehicle system.