NDLI: Stability-guaranteed dynamic ElGamal cryptosystem for encrypted control systems

Content Provider	IET Digital Library
Author	Teranishi, Kaoru Shimada, Naoki Kogiso, Kiminao
Abstract	Despite the importance of cyber-security for networked control systems, no suitable cryptosystem exists for networked control systems that guarantees stability and has low computational complexity. This study proposes a novel dynamic ElGamal cryptosystem for encrypted control systems. The proposed cryptosystem is a multiplicative homomorphic cryptosystem, and it updates key pairs and ciphertexts by simple updating rules with modulo operations at every sampling period. Furthermore, the authors modify the proposed cryptosystem by using a dynamic encoder and decoder so that the asymptotic stability of the encrypted control systems is guaranteed. Numerical simulations demonstrate that the encrypted controller with the proposed cryptosystem achieves asymptotic stability while randomly updating key pairs and ciphertexts. The feasibility of the proposed encrypted control system is evaluated through regulation control with a positioning table testbed. The processing time of the proposed encrypted control system is on the order of milliseconds, indicating that the system achieves real-time control.
Starting Page	2242
Ending Page	2252
Page Count	11
ISSN	17518644
Volume Number	14
e-ISSN	17518652
Issue Number	Issue 16, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cta/14/16
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cta.2019.0729
Journal	IET Control Theory & Applications
Publisher	The Institution of Engineering and Technology
Publisher Date	2020-04-25
Access Restriction	Open
Rights License	Creative Commons Attribution-Non Commercial-No Derivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Subject Keyword	Asymptotic Stability Computational Complexity Cryptographic Protocols Cryptography Data Security Encrypted Control System Encrypted Controller Multiplicative Homomorphic Cryptosystem Networked Control System Protocol Public Key Cryptography Stability Stability in Control Theory Stability-guaranteed Dynamic ElGamal Cryptosystem Telecommunication Security
Content Type	Text
Resource Type	Article
Subject	Control and Optimization Control and Systems Engineering Human-Computer Interaction Electrical and Electronic Engineering Computer Science Applications

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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