目前，我国《计算机信息安全保护条例》的权威定义是：通过计算机技术和网络技术手段，使计算机系统的硬件、软件、数据库等受到保护，大可能不因偶然的或恶意的因素而遭破坏、更改或泄密，系统能够正常运行，使用户获得对信息使用的安全感。信息安全的目的是保护信息处理系统中存储、处理的信息的安全，其基本属性有：完整性、可用性、保密性、可控性、可靠性。
随着信息技术迅猛发展，计算机及其网络、移动通信和办公自动化设备日益普及，国内大中型企业为了提高企业竞争力，都广泛使用信息技术，特别是网络技术。企业信息设施在提高企业效益的同时，给企业增加了风险隐患，网络安全问题也一直层出不穷，给企业所造成的损失不可估量。
DCS系统作为企业生产控制所必不可少的组成部分，技术上基于计算机网络技术。因此，DCS 系统同样面临着网络安全的问题。由于 DCS 系统在工厂内的重要性和特殊性，确保 DCS 系统的信息安全更为重要。这对于确保工厂的平稳运行和安全生产具有极为重要的意义。
In IEC 62443, the definition of information security for industrial control system is [1-2]: "A) the measures taken to protect the system; b) the system status obtained from the measures taken to establish and maintain the protection system; c) it can be free from unauthorized access to system resources and unauthorized or accidental change, damage or loss; d) based on the ability of the computer system, it can ensure that unauthorized personnel and the system can neither modify the software and its data nor access the system functions, but ensure that authorized personnel and the system are not blocked; E) prevent Illegal or harmful intrusion into the industrial control system, or interference with its correct and planned operation. "
At present, the authoritative definition of the regulations on the protection of computer information security in China is that the hardware, software and database of the computer system are protected by means of computer technology and network technology, which is most likely not to be damaged, changed or leaked due to accidental or malicious factors, and the system can operate normally, so that users can obtain a sense of security for the use of information. The purpose of information security is to protect the security of the information stored and processed in the information processing system. Its basic attributes include integrity, availability, confidentiality, controllability and reliability.
With the rapid development of information technology, computers and their networks, mobile communications and office automation equipment are becoming more and more popular. In order to improve the competitiveness of enterprises, large and medium-sized enterprises in China have widely used information technology, especially network technology. Enterprise information facilities not only improve the efficiency of enterprises, but also increase the risk hidden dangers to enterprises. Network security problems have been emerging in endlessly, causing immeasurable losses to enterprises.
As an indispensable part of enterprise production control, DCS system is technically based on computer network technology. Therefore, DCS system also faces the problem of network security. Due to the importance and particularity of DCS system in the factory, it is more important to ensure the information security of DCS system. This is of great significance to ensure the smooth operation and safe production of the plant.
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