Abstract
Research on stealthiness has become an important topic in the field of data integrity (DI) attacks. To construct stealthy DI attacks, a common assumption in most related studies is that attackers have prior model knowledge of physical systems. In this paper, such assumption is relaxed and a covert agent is proposed based on the least squares support vector regression (LSSVR). By estimating a plant model from control and sensory data, the LSSVR-based covert agent can closely imitate the behavior of the physical plant. Then, the covert agent is used to construct a covert loop, which can keep the controller’s input and output both stealthy over a finite time window. Experiments have been carried out to show the effectiveness of the proposed method.
Highlights
Industrial control systems (ICSs) are widely deployed in modern critical infrastructures (CIs), and their incapacitation can cause serious damage to equipment, environment, or even people’s lives [1]
To get the corresponding stealthy time, the cumulative sum (CUSUM) algorithm is applied to the data that are obtained from the two observers in the simulations
The thresholds in CUSUM algorithm are determined based on the normal data in the time window ranging from 200 s to 1000 s, and each threshold is selected under the condition that it will not cause any false alarm on the normal data
Summary
Industrial control systems (ICSs) are widely deployed in modern critical infrastructures (CIs), and their incapacitation can cause serious damage to equipment, environment, or even people’s lives [1]. Among the existing research on ICSs security, a great deal of attention has been given to the study of stealthy data integrity (DI) attacks [4, 5], which can violate the integrity of control and sensory data. The purpose of such attacks is to disrupt the physical process while remaining stealthy with respect to anomaly detectors [6]. In [13], the authors presented a covert agent structure and showed that the better the covert agent’s model of the plant, the easier it was for the covert agent to hide its actions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
