Dedicated Computer Network Security System

The development and wide application of information technology have and will deeply affect people with their life style, work manner and manage mode, and it plays a increasingly important role to push national modernization and social civilization forward. Due to it's uniqueness, information technology also brings huge risk of information security during the whole process of informationization. Information security relate to all the aspects of national, public and personal security, to get a smooth way of modernization and informationization, we must solve all kinds of problem and eliminate growing risk of information security.With the IT application widely implementing in government and enterprises, Office automation, standardization, systematization and interconnection become more popular. All kinds of application system developed and implemented in government and enterprises, there is plenty of confidential information in their computer network, for safety, most networks physically separated from the outer networks, especially the Internet, therefore , they became private networks. Compared with Internet, private networks have much distinction:1 , Most information run in private networks is confidential, seriousmuch about information security,2, The equipments and terminals connected to private network are completely under control, convenient for integrating supervising.3, The application demand is definite, convenient for security supervising.4, The private network must further cut into subnet accordingservices.The paper studied the situation of computer security, network security and information security in private network. Using the new production of computer network security and practice of author, fully considered the characteristic of private network, form a security system special for private network. The system follows these principles: distributed control , integrated supervising, mutual reinforce, multi-protection. According the 3-essential of the private network security: computer security, network security, information security, the system stresses the essential respectively to build safe information, safe computer and safe network. Puts safe information into safe computer and then connects safe computer into safe network, so, a safe private network with the core of safe information comes into being.