Securing Networked Control System with Homomorphic Authenticated Encryptions

Abstract

Enhancing the security of the control system is necessary since it can directly cause physical problems in real world. It is important to protect the controller itself and the signal between the controller and the plant since an attacker can steal or manipulate it during the process. There is a paper proposing a solution to prevent the data from stealing. They use fully homomorphic encryption (FHE) to secure the controller. However, even though the attacker can not steal the signal, he or she still can manipulate the signal or break the system. In this paper, we propose a homomorphic authenticated encryption(HAE) scheme which can enable the plant to verify whether the input data is correctly evaluated. By using the label, discrete fourier transform(DFF) and ring learning with errors(RLWE), we can protect the data from the stealing and manipulating. Furthermore, we implement the scheme with quadruple water tank model.