关键词: P2P网络, 激发型蠕虫, 动态性, 传播建模, 基本繁殖率, 仿真

Abstract: In this paper,propagation pattern of reactive worms is studied.The propagation model and the immunization model of reactive worms are proposed,in which dynamic factors of P2P networks are taken into account.Further,the sufficient condition of worms not attaining an endemic state is deduced from the model of propagation of reactive worms in applying Epidemiology.Large scale simulation experiments validate the models and the sufficient condition.All the simulations also show that among all P2P-related parameters,the downloading rate is the crucial factor to the propagation of reactive worms,the basic reproduction number of worms is the index of propagation capability of worms,and the sufficient condition is helpful to early warn the presence of an epidemic.In addition,by using data from the Gnutella network,the propagation capability,propagation speed and the risk of reactive worms are predicted and evaluated based on the propagation model.Prediction and evaluation show that it is time that reactive worms should be taken into account.

Key words: P2P networks, reactive worms, dynamics, propagation modeling, basic reproduction number, simulation