The Study And Implement Of Computer Information Network Content Filtering System

The rapid development of Internet makes it easy for people to obtain information,but meanwhile all kinds of pernicous information floods with it, and particularly reactionary and erotic information as well as violent information immensely bane social equableness and men sana in corpore sano. The computer information network content filtering system the paper studied is between inner net and outer net as a bridge.In the case of obtaining network information the system goes ahead protocol analysis through the open interface for protocol analysis, and then use more efficient Multiple Pattern Matching Li-Jiang algorithm to analyses and recognizes the pernicous information accoding to the key words the users have set in order to realize real-time filtering for pernicous information.At first This paper formulates the necessity for depurating network information content,and introduces the history of information security and study point in information security.Also this paper analyses in detail the key technology of content filtering such as data frame capture,bridge, network protocol analysis and content analysis.And then this paper comes up with the solution for content filtering facing application layer which is based on the technology of protocol analysis and format conversion in combination with text filtering techonology of Multiple Patterns Matching..Also this paper amplifies on the design and the implement method of each module.Finally this paper introduces how the client of content filtering system manages the keywords and log and makes suggestion for the improvement of the system.