Encrypted control system with quantiser

摘要

This study considers the design of encrypted control systems to secure data privacy when the control systems operate over a network. In particular, the authors propose to combine Paillier cryptosystem with a quantiser whose sensitivity changes with the evolution of the system. This allows the encrypted control system to balance between the cipher strength and processing time. Such an ability is essential for control systems that are expected to run real time. It also allows the closed-loop system to achieve the asymptotic stability for linear systems. Extensions to event-triggered control and non-linear control systems are also discussed.