Abstract: In order to analyze the security risk of 802.11 Wireless Local Area Network(WLAN) on defensing sniffer attack, this paper presents a security assessment model based on Technique for Order Preference by Similarity to Ideal Solution(TOPSIS). By the characters of the wireless sniffer, combining with the Analytical Hierarchy Process, two evaluation systems which are the certainty of chance and the possibility of successfully attacking are established. According to the network statistics and expert experience data, judgment matrix is built up to calculate the weight of each assessment index. TOPSIS method is used to establish the risk assessment system. Modeling analysis result shows the rank of WLAN’s security status and the weak link that will cause risk, which makes it easy to strengthen security measures and improve the safety performance.

Key words: Wireless Local Area Network(WLAN), security assessment, sniffer attack, risk analysis, Technique for Order Preference by Similarity to Ideal Solution(TOPSIS) algorithm, Analytic Hierarchy Process(AHP)

摘要： 为分析802.11无线局域网(WLAN)防御嗅探攻击的安全风险，提出一种基于TOPSIS算法的评估模型。根据嗅探攻击的特点，结合层次分析法，建立攻击可能性和攻击成功性评估指标体系，在此基础上以网络统计及专家经验数据为依据，构造判断矩阵，计算评估指标权重，并利用TOPSIS算法搭建风险值评估系统。建模分析结果表明，评估结果可以呈现 WLAN所处的安全等级和导致风险的薄弱环节，为加强安全措施提供指导。

关键词: 无线局域网, 安全评估, 嗅探攻击, 风险分析, TOPSIS算法, 层次分析法

CLC Number: 

• TP393