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Recently, active worms have done significant damage due to their rapid propagation over the Internet. The authors studied propagation mechanisms of active worms employing single target discovery technique and various combinations of two or three different target discovery techniques from attackers' perspective. They performed a series of simulation experiments to investigate their propagation characteristics under various scenarios. They found uniform scanning to be an indispensable elementary target discovery technique of active worms. Their major contributions in this paper are first, they proposed the discrete time deterministic Compensation Factor Adjusted Propagation (CFAP) model of active worms; and second, they suggested the combination of target discovery techniques that can best accelerate propagation of active worms discovered from results of the comprehensive simulations.
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