Abstract
Control systems in general and networked controls systems in particular are vulnerable to harmful noise effect and malicious cyber-attacks that may have devastated outcomes on sensitive applications. One approach to address these threats is to introduce a stringent security and privacy schemes that able to protect the attacked systems. This paper addresses this issue by proposing a privacy scheme, for feedback signals, stemmed from the well-known spread spectrum principle and the information system theory. In order to confirm the efficiency of the proposed scheme in offering a good level of control system privacy, a theoretical analysis is provided and supported by a simulation example introduced to one of the relatively weak control systems to noise and malicious attacks namely Higher Order Iterative Learning Control (HOILC).
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