With the development of information technology, the network connection of industrial control system (ICS) and information technology (IT) is becoming more and more closely. What's more, the security issues of traditional IT systems in industrial control system are also more prominent. Early industrial control system mainly uses physical isolation approach to protect security. In this paper, we review the characteristics and reference models of industrial control system and analyze the current security status of industrial control system. Moreover, we propose a defense-in-depth system, security policies of active protection and passive monitoring for these security issues. Besides, we also discuss the key technologies and summarize the full text.
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Fan et al. (2015) studied this question.