The Ssl Protocol In The Remote Monitoring System For Industrial Ethernet Applications

With the rapid development of network information technology, the industrial ethernet technology is widely applied to the industrial control system. It is a tendency of automatic control area that industrial control network is designed by the industrial ethernet technology. The industrial ethemet control system with the remote monitor has broad prospect of application and significance of study. However, the remote control system may meet danger of the network attack, because the remote monitor and local industrial ethemet control system need to transfer field data by Internet. Therefore, it is important for protecting the data with some security methods when designing an industrial ethemet control system. In this paper, we apply SSL protocol to design a SSL security module for the industrial ethemet control system. This module has the functions of data encryption, data integrality verifying and user authentication.Firstly, the design of Industrial Ethernet Remote Monitor System applied to Internet is presented in this paper. The security problems of the system are analyzed. Then the SSL protocol is analyzed thoroughly, and the principles, protocol architecture and relation between it and TCP/IP protocol set are introduced comprehensively. When designing the SSL security module, the system architecture is presented first, then the module is realized by using OpenSSL, which is a kind of shared software and provides many application program interfaces to lighten the burden of design work effectively. The SSL security module has realized the following functions: setting parameters by user, negotiating to select encryption algorithm between clients and server, creating the security link between clients and server, verifying data integrality, authenticating user, control the access to server data sources, concurrent processing of server process, transferring the data of server to remote clients through the security link.Finally, the application mode of the SSL module is presented and the functions of it is validated. Using the SSL module in the industrial ethemet control system, the security of system can be strengthened effectively.