非结构化对等网中被动蠕虫传播的性能

Performance analysis of passive worms over unstructured P2P network

针对被动蠕虫对非结构化对等网的安全构成的严重威胁,考虑P2P用户的实际情况,建立了一个带有死亡率、离线率和在线率的时滞SEIRS模型,得到被动蠕虫灭绝与否的阈值——基本再生数。时滞包括潜伏期和临时免疫期。潜伏期主要由下载文件的时间决定,而临时免疫期与用户的抗恶意软件性能有关。仿真研究了不同参数对模型的影响,尤其是时滞对模型的影响,为有效控制被动蠕虫的传播提供了理论指导。

Passive worm, one of the major forms of peer-to-peer （P2P） worms, has posed serious security threats to the functioning of unstructured P2P networks. A delayed SEIRS epidemic model with death rate, offline rate and online rate was constructed, which takes the actual circumstances of P2P users into consideration. The threshold, the basic reproductive number, was obtained, which governs whether a passive worm is extinct or not. In this model, the time delay includes latent and temporary immunity periods, where the former was mainly governed by the time to download a file, and the latter was related to the performance of anti malicious software. The impacts of different parameters on this model were studied by simulation. In particular, the effect of time delay can provide an important guideline for the control of unstructured P2P networks as well as passive worm defense. Some future works were introduced.