  In Cyber-Physical Systems (CPSs), inference based on communicated data is of
critical significance as it can be used to manipulate or damage the control
operations by adversaries. This calls for efficient mechanisms for secure
transmission of data since control systems are becoming increasingly
distributed over larger geographical areas. Distortion based security, recently
proposed as one candidate for CPSs security, is not only more appropriate for
these applications but also quite frugal in terms of prior requirements on
shared keys. In this paper, we propose distortion-based metrics to protect CPSs
communication and show that it is possible to confuse adversaries with just a
few bits of pre-shared keys.
