Abstract: In order to improve the propagation efficiency of the worm, a worm discrete propagation model based on uneven random scan was established under the in-depth study of even-scanning strategy. For researching this model dynamically, three important factors influencing the propagation of worm were researched quantitatively, such as immunization rate of infected hosts, immunization rate of susceptible hosts and the number of hosts scanning. The infected hosts rate reaches 0.8 and above, ahead of 1000 seconds to reach the peak number, and delays 2000 seconds to be restrained half. Finally, the simulation results indicate that this model has high efficiency.

Key words: worm, uneven random scan, discrete propagation model, distributing density of hosts, network attack

摘要： 为进一步提高蠕虫传播效率，深入研究了非均匀扫描策略，建立了非均匀随机扫描的蠕虫传播模型，在此基础上从已感染主机免疫率、易感染主机免疫率、主机扫描数三个角度定量地分析了非均匀随机扫描策略下网络蠕虫的传播效率，得到在非均匀扫描模式下主机总体感染率峰值可达0.8以上，达到峰值提前近1000s，抑制过半延迟近2000s。最后通过模拟实验验证了非均匀随机扫描模型具有更高的蠕虫传播效率。

关键词: 蠕虫, 非均匀随机扫描, 离散传播模型, 主机分布密度, 网络攻击