Based On Content Security, Lan Monitoring System (csblan) Design And Realization

21^st century is an era of information and network economy. But with the wide spread of computer network and the rapid development of network technology, the computer crime has changed into network crime or information crime, which in turn made 2002 "the year of the information network security problem". Thus the security of network has become the focal point of the IT industry. In order to reinforce the control of the network information and guarantee the security of the content promulgated on networks, this paper proposes a kind of framework of the LANs-monitoring system based on the content security. Beginning from the present network security problem, the paper analyzes the existing network technologies and their limitations, as well as the impending problems of protecting the security of networks, therefore by proposing the necessities of the LAN-monitoring system, the paper presents a kind of framework of the LANs-monitoring system based on the content security on the basis of the research condition in and out of our country. In the paper we first introduce the function of every components, then emulate and explain the key technologies used in the course of implementation. In the key technology, we emphasize the multi-match algorithm which directly affects the system performance. It is proved that our self-designed algorithm is better than the famous BM algorithm as well as the cutting-edge algorithm of agrep. The LANs-monitoring system based on the content security designed by ourselves can realize to monitor and manage the network activity and its content multilayeredly and multiaspectedly. This kind mechanism provides the manager with the effective means of monitoring and checking the current functioning condition of network systems, therefore can effectively secure the security of content promulgating on the networks.