Cybersecurity-Enhanced Encrypted Control System Using Keyed-Homomorphic Public Key Encryption

Encrypted control systems are secure methods that use the cryptographic properties of a specific homomorphic encryption scheme. This study proposes cyberattack-detectable encrypted system and validates its effectiveness using proportional integration derivative (PID) position-control for an industrial motor. The proposed uses keyed-homomorphic public-key scheme real-time detection cyberattacks, such as signal parameter falsification. Additionally, novel quantizer is presented to reduce computation cost quantization-error effects on performance. demonstrated significant improvement, reducing time by 47.3 % compared our previous quantizer, decreasing effect 30.6 widely-used gain-multiplying quantizer. Moreover, this establishes conditions through theorem avoid overflow in system. Experimental validation confirms effectively conceals operation, aids designing quantization gains prevent overflows. Notably, results falsification attack tests highlight enables attacked components within parameters signals, representing advantage study.