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随着网络安全重要性的不断提高,网络结构安全审计(Network structure security audit,简称NSSA)的研究与应用正在得到更多的关注.NSSA实现对网络中各种活动的行为辨识,意图理解和影响度量,以支持合理的安全评估.它是对网络安全性进行分析的一种手段,网络安全审计系统可以借助其宏观地把握整个网络的安全状况,评估网络的安全性,为管理决策提供重要依据.本文首先对当前网络安全的现状进行了分析,然后对现有的安全审计技术类型进行归类,并指出其存在的问题.“,”With the increasing importance of Network security, the research and application of Network Structure Security Audit (NSSA) are attracting more and more attention.NSSA implements behavior identification, intent understanding, and impact measurement for various activities in the network to support reasonable security assessment.It is a means to analyze the network security. The network security audit system can grasp the security status of the whole network, evaluate the security of the network, and provide an important basis for the management decision.This paper first analyzes the current situation of network security, then classifies the existing security audit technology types, and points out the existing problems.