I. Introduction
The industrial cyber-physical systems (ICPSs), which tightly integrate physical and cyber-spaces with communication, computation, and control techniques, are made possible via the widespread application to the industrial field [15]. By fusing network technology with physical systems, such systems significantly boost system efficiency, but it also renders ICPSs vulnerable [3], [17]. As in the well-known Stuxnet attacks, attackers might seize control of sensors and actuators and alter the data to carry out their malicious intents [1], [8].