Dr. Chiu graduated from Dept. of EE, National Taiwan University. His research focused on secure multicast communication and key distribution. Currently, Dr. Chiu's main responsibility in TMRTEK is developing secure embedded systems. Related topics include intrusion detection, OT protocols, and anomaly analysis in industrial networks.
The main development results include:
- A cybersecurity defense solution of robotic process automation (RPA). This solution is displayed in CYBERSEC 2020.
- An OT cybersecurity platform, which is a project sponsored by Industrial Development Bureau, Ministry of Economic Affairs. This project is elected as a highlighted project.
In this talk, we will introduce one of Mitsubishi's PLC network protocols, Melsoft. Melsoft is usually the default protocol of Mitsubishi PLCs. In September 2023, TMRTEK's products took a test in ACW SOUTH, and got the score of 100% detection cover rate. We achieve this by inspecting deeply into OT protocols.
By delving into the command level, we could carry out the most detailed of behavior analysis in OT protocols. We will share our experience of OT network behavior analysis by using LSTM (Long Short-Term Memory). By learning from past data, LSTM could predict the data value of the next time slot. Therefore, it is a suitable tool to find out the network traffic which is different from the normal pattern. LSTM could be used as a tool of discovering anomaly of connection number, anomaly of transmission amount, and abnormal OT protocol commands.
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