Gan Ruimeng, Xiao Yue, Shao Jinliang, Qin Jiahu
IEEE Trans Cybern. 2021 Feb;51(2):994-1003. doi: 10.1109/TCYB.2019.2914144. Epub 2021 Jan 15.
In this paper, we investigate the issue of security on the remote state estimation in cyber-physical systems (CPSs), where a wireless sensor utilizes the channel hopping scheme to transmit the data to the remote estimator over multiple channels in the presence of periodic denial-of-service attacks. Assume that the jammer can interfere with a subset of channels at each attack time in active period. For an energy-constraint jammer, the problem of how to select the number of channels at each attack time to maximally deteriorate the CPS performance is investigated. Based on the index of average estimation error, we introduce two different attack strategies, which include selecting identical number of channels and unequal number of channels at each attack time, and further show theoretically that the attack effect by selecting unequal number of channels is better than that of selecting identical number of channels. By formulating the problem of selecting the number of channels as integer programming problems, we present the corresponding algorithm to approximate the optimal attack schedule for both cases. The numerical results are presented to validate the theoretical results and the effectiveness of the proposed algorithms.
在本文中，我们研究了信息物理系统（CPS）中远程状态估计的安全问题，其中无线传感器采用信道跳变方案，在存在周期性拒绝服务攻击的情况下通过多个信道将数据传输到远程估计器。假设干扰器在活跃期的每个攻击时刻都能干扰一部分信道。对于能量受限的干扰器，研究了如何在每个攻击时刻选择信道数量以最大程度地降低CPS性能的问题。基于平均估计误差指标，我们引入了两种不同的攻击策略，包括在每个攻击时刻选择相同数量的信道和不相等数量的信道，并进一步从理论上表明，选择不相等数量信道的攻击效果优于选择相同数量信道的攻击效果。通过将选择信道数量的问题表述为整数规划问题，我们针对这两种情况提出了相应的算法来近似最优攻击调度。给出了数值结果以验证理论结果和所提算法的有效性。
