Recently, the security issues in networked control systems (NCSs) have become a major challenge, since NCSs are vulnerable to malicious attacks. In this article, we consider the false data injection (FDI) attacks employed on two communication channels—namely: 1) sensor-to-controller and 2) controller-to-actuator channels. The FDI attacker aims to disturb the systems by injecting external control inputs and fake sensor measurements in the form of Gaussian noises. The problems of attack allocation with resource constraints are studied, i.e., the attacker decides instants of attack occurrence as well as the allocation of attack energy in order to obtain the optimal attack strategy. Also, the optimal attack strategies with respect to both time-invariant and time-varying attack covariances are proposed for two channels, where the time-varying attack covariances suffer a given budget. Finally, the feasibility of theoretical results is validated by a numerical example of an unmanned aerial vehicle.

中文翻译：

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具有两个通信通道的网络控制系统的错误数据注入攻击的最优分配

最近，由于NCS容易受到恶意攻击，因此网络控制系统（NCS）中的安全性问题已成为一项主要挑战。在本文中，我们考虑了在两个通信通道上使用的错误数据注入（FDI）攻击-1）传感器到控制器和2）控制器到执行器通道。FDI攻击者旨在通过以高斯噪声的形式注入外部控制输入和虚假的传感器测量值来干扰系统。研究了具有资源约束的攻击分配问题，即攻击者决定攻击发生的时刻以及攻击能量的分配，以获得最优的攻击策略。此外，针对两个渠道，提出了针对时不变和时变进攻协方差的最优攻击策略，随时间变化的攻击协方差受给定预算的影响。最后，通过无人飞行器的数值算例验证了理论结果的可行性。