Wyner wiretap-like encoding scheme for cyber-physical systems
This addresses secure communication in cyber-physical systems for control engineers, but it appears incremental as it adapts an existing wiretap scheme to a specific domain.
The authors tackled the problem of exchanging secret messages in cyber-physical systems without using cryptography by proposing a Wyner wiretap-like encoding scheme that exploits closed-loop feedback control and asymmetry in plant model knowledge between the defender and eavesdropper, with effectiveness demonstrated through a numerical example.
In this study, the authors consider the problem of exchanging secrete messages in cyber-physical systems (CPSs) without resorting to cryptographic solutions. In particular, they consider a CPS where the networked controller wants to send a secrete message to the plant. They show that such a problem can be solved by exploiting a Wyner wiretap-like encoding scheme taking advantage of the closed-loop operations typical of feedback control systems. Specifically, by resorting to the control concept of one-step reachable sets, they first show that a wiretap-like encoding scheme exists whenever there is an asymmetry in the plant model knowledge available to control system (the defender) and to the eavesdropper. The effectiveness of the proposed scheme is confirmed by means of a numerical example. Finally, they conclude the study by presenting open design challenges that can be addressed by the research community to improve, in different directions, the secrete message exchange problem in CPSs