Abstract
Abstract Cyber security is currently a serious problem for not only office automation (OA) systems but also industrial control systems (ICSs). If ICSs are cyber-attacked, serious accidents such as explosions and leakage of harmful substances may occur. Therefore, cyber-security is a very important factor in discussing safety, and should not be considered separately. Risk analyses have been conducted in plant design and operation stage so as to avoid the risk to the operation of ICSs. However, since conventional analysis methods focus on the “equipment” and “products” of a plant, it is difficult to consider the upper layer system. In this paper, we suggest a risk assessment for safety that it is possible to link the physical processes and ICS. We propose a risk analysis method using the Systems Theoretic Accident Model and Processes (STAMP).
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