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Controller Area Network (CAN) is one of the in-vehicle network protocols thatis used to communicate among Electronic Control Units (ECUs) and has beende-facto standard. CAN is simple and has several vulnerabilities such as unableto distinguish spoofing messages because it does not support any authenticationor sender identification properties. In previous work, some voltage-basedmethods to identify the sender node have been proposed. The methods canidentify ECUs with high accuracy. However, the accuracy of sourceidentification depends on a feature that is extracted from a continuousfunction of voltage use sampling. In general, as the sampling rate increases,the accuracy of identification is improved. Though the amount of data used forthe identification increases too. Hence, it is desired to create an IntrusionDetection System (IDS) that identifies ECUs using few sampling features asthere is a limited computing resource in vehicles. In this paper, we propose adelay-time based sender identification method of ECUs. We confirm that theproposed method achieved a true positive rate of 96.7% in CAN bus prototypeagainst spoofing attack from a compromised ECU, detecting spoofing attack froman unmonitored ECU with a true positive rate of 98.0% in real-vehicle.

Divider: Delay-Time Based Sender Identification in Automotive Networks