Availability Model of Two-Zone Physical Security System considering Cyber Attacks and Software Update

The article analyzes the process of functioning of physical security systems in the conditions of component failures, cyberattacks and software updates. A zonal model of physical security systems, which includes motion detection and access control subsystems, have been built. Updating the software functions of each zone, attacks on the physical component of the motion detection subsystem, and cyber attacks on the access control system have been investigated. To model software updates, a multi-fragment model, including 9 states of each fragment and program update states has been created. To study the behavior of the model while changing the input parameters, Matlab scripts have been developed. Simulation results allow to evaluate the availability function minimum value, availability function value in stationary mode, time interval for the transition of the availability function to the stationary mode.