中文摘要：

邮件蠕虫利用e—mail在具有power—law结构特点的网络中进行传播，使得传统的蠕虫防御策略失效。结合power-law网络拓扑结构的特点，引入节点免疫和邮件服务器参与两种防御策略，分别对重复感染与非重复感染两种类型的邮件蠕虫传播进行了实验仿真。结果表明，节点的优先免疫类型、免疫起始时间、邮件服务器参与防御时间及蠕虫邮件识别正确率都与邮件蠕虫的传播有着紧密联系。

英文摘要：

E-mail worm spreads in the power-law network by sending e-mail. The policies which were used to defend traditio- nal worm were improper to defend e-mail worm. This paper presented the e-mail worm simulation based on power-law topology on two e-mail worm styles including repeated infection and unrepeated infection by considering two defense policies included node immunization and e-mail server＇ s filter function. The results show that many factors included the first immunized node style, the start-time of immunization, the start-time of e-mail server＇ s filter and the filter preciseness have great influence on e-mail worm propagation.