期刊
AUTOMATICA
卷 112, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.automatica.2019.108698
关键词
Cyber-physical system; Attack detection; Replay attack; Scheduling strategy; Periodic watermarking schedule
资金
- National Key Research and Development Program of China [2018YFB0803501]
- National Natural Science Foundation of China [61833015]
- NSW Cyber Security Network in Australia [P00025091]
We consider periodic watermarking scheduling for detecting discontinuous replay attacks in Cyber- Physical Systems (CPSs). The existing methods of imposing continuous watermarks on the nominal control inputs may result in the waste of control cost when system detectors are not sensitive to the added watermarks, since the attacker may be absent for a considerably long time. For example, in the famous Stuxnet event, the attacker only launches the attack for a short period each month in order to avoid being detected. In this paper, we firstly formulate a one-time attack duration model for such discontinuous replay attacks. Then, by exploiting the attack model, we propose a periodic watermarking strategy which aims to reduce the control cost. Furthermore, we obtain an optimal periodic watermarking strategy for the approximate detection performance. Extensive simulations over a quadruple water tank system are provided to demonstrate the effectiveness of the proposed strategy. (C) 2019 Elsevier Ltd. All rights reserved.
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