Controller encryption for discrete event systems
Raphael Fritz, Moritz Fauser, Ping Zhang · 2019
The use of networked controllers is rising and with it the requirements for safe and secure communication. In this paper, a controller encryption scheme for discrete event systems is presented that secures the communication and the information inside the controller. By adapting a somewhat homomorphic encryption scheme to encrypt the controller parameters and variables, it is much more difficult for attackers to gather information about the controller and plant. The homomorphic encryption scheme allows the evaluation of encrypted data without additional decryption and encryption steps. Thus the controller can be evaluated completely in the encrypted domain. We show how to change a controller based on a signal interpreted Petri net (SIPN) into an encrypted SIPN controller and illustrate the approach by a simulation example.