入侵检测（Intrusion Detection），它通过对计算机网络或计算机系统中得若干关键点收集信息并对其进行分析，从中发现网络或系统中是否有违反安全策略的行为和被攻击的迹象-IDS (Intrusion Detection), it is through the computer network or computer systems have a number of key in the information collected at and analyze, discover whether the network or system in violation of security policy behavior and indications of attack