Divider: Delay-Time Based Sender Identification in Automotive Networks

2020 IEEE 44th Annual Computers, Software, and Applications Conference (COMPSAC)、Madrid, Spain, SpainController Area Network (CAN) is one of the in-vehicle network protocols that is used to communicate among Electronic Control Units (ECUs) and has been de-facto standard. CAN is simple and has several vulnerabilities such as unable to distinguish spoofing messages because it doesn't support any authentication or sender identification properties. In previous work, some voltage-based methods to identify the sender node have been proposed. The methods can identify ECUs with high accuracy. However, the accuracy of source identification depends on a feature that is extracted from a continuous function of voltage use sampling. In general, as the sampling rate increases, the accuracy of identification is improved. Though the amount of data used for the identification increases too. Hence, it is desired to create an Intrusion Detection System (IDS) that identifies ECUs using few sampling features as there is a limited computing resource in vehicles. In this paper, we propose a delay-time based sender identification method of ECUs. We confirm that the proposed method achieved a true positive rate of 96.7% in CAN bus prototype against spoofing attack from a compromised ECU, detecting spoofing attack from an unmonitored ECU with a true positive rate of 98.0% in real-vehicle

11CH4-molecule production using a NaBH4 target for 11C-ion acceleration

Solid-state materials suitable for use as proton irradiation targets were investigated for producing high-purity 11CH4 molecules for heavy-ion cancer therapy. The radioactivity of gas produced by proton irradiation was measured for several target materials. Also, the radioactive molecular species of the produced gas were analyzed by radio gas chromatography.We found that 5 × 1012 11C molecules could be collected by proton irradiation on a NaBH4 target. We also found that the 11CH4 molecules were produced and collected directly from the irradiated target, owing to the hydrogen atoms boundin the solid-state NaBH4