Cyber-security countermeasures are important for IIoT (industrial Internet of things) systems in which IT (information technology) and OT (operational technology) are integrated. The appropriate asset management is the key to creating strong security systems to protect from various cyber threats. However, the timely and coherent asset management methods used for conventional IT systems are difficult to be implemented for IIoT systems. This is because these systems are composed of various network protocols, various devices, and open technologies. Besides, it is necessary to guarantee reliable and real-time control and save CPU and memory usage for legacy OT devices. In this study, therefore, (1) we model various asset configurations for IIoT systems and design a data structure based on SCAP (Security Content Automation Protocol). (2) We design the functions to automatically acquire the detailed information from edge devices by “asset configuration management agent”, which ensures a low processing load. (3) We implement the proposed asset management system to real edge devices and evaluate the functions. Our contribution is to automate the asset management method that is valid for the cyber security countermeasures in the IIoT systems.
In this paper, we study on the maximum read range of 2.45GHz passive RFID tag when metallic plate existed behind it. From a theoretical analysis, computer simulation and experiment result, they reveal that if the RFID tag and metallic plate are separated by several mm, it is able to achieve the same read range as free-space environment. Additionally, we also include comparative study of dipole antenna model and µ-chip antenna model. Simulation result shows that the use of dipole antenna model can bring the same performance with shorter analytical time compare to µ-chip antenna model. Finally, experimental study was conducted to confirm the validity of previous analysis.
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