Research on Network Security

The rapid development of Internet has enabled people to study,work and life more closely integrated.The network gives our lives with more convenience and also allows the network structure more complicated,more difficult to maintain,therefore computer network systems security issue becomes increasingly acute.Network security issues' hacker site not only provides a large number of system defects and attacking methods,it also provides a large number of easy-to-use system vulnerability scanning and attack tools,attackers do not need to have a dedicated system knowledge to easily attack the security flaw in the system.Therefore,network security defense is a long-term hard task.How to enhance the security of computer network system of research becomes the focus of the international limelight.New intrusion detection system is the key technologies and important means to protect the network system security.