This paper proposes an encrypted observer-based control paradigm for enhancement of cybersecurity in networked control systems. The proposed paradigm exploits a semi-homomorphic encryption technique which enables the required computation to be done over encrypted data without any need for decryption at controller and observer levels. This improves the privacy of sensitive information such as command and sensor measurement signals. We study the challenges involved with the implementation of the proposed strategy and establish the conditions on system parameters to guarantee the stability of the closed-loop system. Some simulations experiments are performed on the Tennessee-Eastman process to illustrate the effectiveness of the proposed approach.

本文提出了一种基于观察者的加密控制范例，以增强网络控制系统中的网络安全性。所提出的范例利用了一种半同态加密技术，该技术使得可以对加密数据进行所需的计算，而无需在控制器和观察者级别进行解密。这提高了敏感信息（如命令和传感器测量信号）的隐私性。我们研究了实施所提出的策略所面临的挑战，并为保证闭环系统的稳定性建立了系统参数条件。在田纳西-伊士曼过程中进行了一些模拟实验，以说明所提出方法的有效性。