Formal Analysis of Security Properties of Cyber-Physical System Based on Timed Automata

For the research and development of Cyber-Physical System (CPS), the security problems have gradually emerged. This paper explores the design of security for CPS. We focus on a kind of common attacks that destroys the critical system parameters to paralyze the system. Timed Automata are used for formalizing the behaviors of CPS, since the requirements on time are necessary for CPS. The modeling of CPS includes three aspects: the interactions between the various components of the CPS, the attacker, and the recovery mechanism. A modeling framework is given to illustrate our method. We also take the network water level control system as an example to illustrate our modeling processes. By using the model checking tool PAT, the security properties are verified and the results are analyzed.