Study And Application On Instruction Detection System Of The Security Management Of Jiangxi Province Local Tax Bureau

Being the background of "The Project of security management jiangxi province local tax Bureau" and based on the technology of net,this paper is written in combining the theory research with the practice application for setting up the networks security of Instruction Detection System(IDS)with misuse and abnormal detection,and building the networks security in the area..At first,the paper fully expatiates the basic viewpoint of networds security,dynamic security model of F2DR,and the basic concept and classification of instruction detection.The paper deeply analyses and compares in detail the principles and classical sorts of misuse and abnotmal detection,At the same time,the paper discusses the basic principles of Host-based and Network-based IDS,and represents the detection rule of Network-based,matching algorithm,the data resource and model structure of Host-based IDS.The paper introduces the frame and technical characteristics and analyses the networks security question faced network companies.we found it is common to be attacked by DDos. Based on the dynamic security model of P2DR and technology of instruction detection system,and we decided to create a method for detecting DDos based on disperse_degree according to the essential character of DDos and the record of IDS..And based this,we create a moudule for defending Ddos based on state_switch by analyzing the character of defending.