分析了当前入侵检测系统所存在的问题，探讨了被动指纹识别技术在入侵检测系统中的应用。
This paper analyzes the problems existing in current intrusion detection system, and probes into the application of passive fingerprinting identification technology in the intrusion detection system.
基于主动、被动探测攻击目标并分析其数据报的网络特征值，可以得出攻击目标的操作系统类型等重要信息，进而得出与之相关的系统漏洞，为入侵和攻击提供重要依据。
By analyzing the networking character values actively and passively, attacker can get a lot of information about target host, such as the type of operating system.
因为操作是被动的，因此入侵者无法判断受到保护的地区。
Because the operation is passive, intruders cannot identify the area being protected.
网络取证把入侵发生后的被动调查转为事件发生之前的主动防御。
Network forensics turns the passive investigation after events to the active defense before events.
入侵诱骗技术变被动防守为主动防御，其中诱骗环境是真实系统的替身，是整个入侵诱骗系统的核心。
The deception environment is the substitute for the real system, and is the core of the IntrusionDeception system.
入侵检测系统(IDS)是一种基于主动策略的网络安全系统，是对常用的被动策略的逻辑补偿，是网络安全系统中的重要组成部分。
Intrusion Detection system (IDS) is an activity based network security system. As the logical supplement of usual passive policy, it is the important part of whole security system.
1939年，在德国入侵波兰的前几天，601中队被动员了起来。
Days before the German invasion of Poland in 1939, 601 squadron was mobilised.
1939年，在德国入侵波兰的前几天，601中队被动员了起来。
Days before the German invasion of Poland in 1939, 601 squadron was mobilised.
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