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.
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