![]() In each phase, we provided effective means of attack and corresponding defensive measures, and the system state was determined correspondingly. Depending on the characteristics of the system and attack–defense methods, we divided our model into two phases: penetration and disruption. This paper proposes a generalized stochastic Petri net (GSPN) model to capture dynamic interaction between the attacker and the defender to evaluate the security of CBTC systems. As CBTC systems are no longer isolated from the outside world but use other networks to increase efficiency and improve productivity, they are exposed to huge cyber threats. Communication-based train controls (CBTC) systems play a major role in urban rail transportation.
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