Abstract
As a new generation of OPC protocol, OPC UA provides a standardized interoperability solution for industrial automation. In order to accelerate the application of OPC UA in industrial control networks, OPC Foundation published OPC UA PubSub protocol. With the gradual opening of industrial control network, the security risks of deep manufacturing facilities are greatly increased, so it is urgent to study the security protection of PubSub protocol. Based on PubSub protocol, we study the characteristics of its deployment environment and the security threats it faces, and point out the defects and solutions of PubSub protocol's own security protection mechanism. At the same time, we propose a security gateway model OSG, which is established between the field equipment layer and the field control layer, in order to deal with the security risks existing in the PubSub protocol.
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