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网络的高速发展给人类带来极大方便的同时,也带来了新的安全威胁,如非授权访问、冒充合法用户、破坏数据完整性、干扰系统正常运行、利用网络传播病毒和线路侦听等[1]。解决内网安全问题的手段有很多,例如使用防火墙、防病毒、入侵检测系统等网络安全产品,制定安全策略、发布管理制度等,但采取上述措施后各种网络安全事件仍频频发生。根据CERT统计[2],计算机犯罪的70%是由
The rapid development of the Internet has brought great convenience to human beings as well as new security threats such as unauthorized access, impersonation of legitimate users, destruction of data integrity, interference with the normal operation of the system, use of the Internet to spread viruses and line sniffing [1]. There are many ways to solve the internal network security problems, such as the use of network security products such as firewalls, antivirus and intrusion detection systems, the development of security policies and the release of management systems. However, various cyber-security incidents still occur frequently after these measures are taken. According to CERT statistics [2], 70% of computer crimes are caused by