Research on whole-process covert attack method of liquid zone control system in a nuclear reactor
Covert attacks significantly threaten the safety of nuclear reactors'liquid zone control systems(LZCSs).Successful covert attacks require an accurate model of the target system and the ability to exit without leaving traces after the attack.This paper proposes a four-stage covert attack method for LZCSs.First,in the attack preparation stage,a dual-mode H2 optimal unbiased finite impulse response(FIR)is offline designed via maximizing the likelihood estimation.This FIR is used to estimate the system states in the state estimation stage.In the attack execution stage,specific attack sequences are designed and injected into the system signal transmission channels to complete a covert attack,considering the anticipated goals and system states.Finally,in the attack exit stage,a constrained optimization problem is constructed based on the system state offsets to provide the optimal attack exit sequences,allowing for an unnoticed exit.The feasibility of the proposed covert attack method is simulated and verified in different situations,taking into account the system noise intensity and attack model accuracy.The experimental results demonstrate that the proposed attack method can covertly achieve its goals and exit without a trace,under the influence of the above factors individually or combined.
liquid zone control systemcovert attackdual-mode H2 optimal unbiased FIRattack exitmaximum likelihood
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维普
