Language Recovery in Discrete-Event Systems against Sensor Deception Attacks

Cyber-physical systems are characterized by the intrinsic combination of software and physical components that usually include (wired wireless) communication devices, sensors, actuators, control processing units. Some wireless devices communicate over insecure channels, rendering cyber-physical at risk malicious attacks might lead to catastrophic damage. This paper touches upon problem sensor deception in supervisory discrete-event systems, where an attacker can insert, delete, or replace readings mislead supervisor induce system We model potential using nondeterministic finite-state transducers then introduce a new defence strategy utilizes insertion functions. Insertion functions type monitoring interface alters system’s behaviour adding extra observable events. Finally, we construct transducer called filter recovers original language generated plant handling altered language. The function cooperate confuse intruder without confusing supervisor.