Practical Aspects of Homomorphic Encryption Schemes for Dynamic Feedback Controllers
Moritz Fauser, Ping Zhang · 2024
Encrypted control systems have attracted much attention in the control community in recent years. Homomorphic encryption (HE) schemes can not only encrypt the signals transmitted over the communication network but also carry out the calculations needed in dynamic feedback controllers in an encrypted environment. Therefore, both the confidentiality of the signals but also the confidentiality of controller parameters can be protected. In this paper, we focus on several important practical aspects of homomorphic encryption schemes such as computational complexity, network load and storage space. For this purpose, two representative homomorphic encryption schemes, namely, the learning with errors (LWE) scheme and the resilient homomorphic encryption (RHE) scheme will be employed in the investigation with the help of well-established quadruple-tank benchmark process.