Abstract:

This article aimed to explore the optimal time strategy for address hopping systems in moving target defense, and proposed a dynamic defense decision model based on game theory to address the asymmetry problem in network attack and defense. The research focused on three address hopping strategies: periodic, event driven, and hybrid driven, quantifying their defense benefits and comparing the effectiveness of strategy selection. By constructing a single-stage complete information zero sum game model, the defense success probability, jump frequency, and benefit function of different strategies were derived. The dimensionless method was used to experimentally analyze key parameters such as jump cost ratio, defense failure loss ratio, attack frequency. The results indicate that the Mixed strategy has the highest defense benefits in most scenarios, but the Fixed strategy has a greater advantage in high jump cost ratios or high defense failure loss ratios. This study provides a theoretical basis for the optimization selection of moving target defense time strategy, revealing the impact mechanism of the coupling effect of attack and defense parameters on strategy decision-making, thereby enhancing the adaptive ability of dynamic defense systems.

Key words: moving target defense, game theory, IP hopping, time strategy