Distortion based Light-weight Security for Cyber-Physical Systems

TL;DR

This paper introduces a lightweight security approach for cyber-physical systems using distortion-based metrics, enabling secure data transmission with minimal shared keys to prevent adversaries from accurately learning system states.

Contribution

It proposes a novel distortion-based security mechanism tailored for CPS, demonstrating effective state protection with limited pre-shared keys.

Findings

Distortion-based security can effectively protect CPS communication.

A linear dynamical system can obscure its state with minimal key bits.

The approach is suitable for resource-constrained distributed systems.

Abstract

In Cyber-Physical Systems (CPS), 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 secure transmissions in CPS, 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 CPS communication and show that it is possible to confuse adversaries with just a few bits of pre-shared keys. In particular, we will show that a linear dynamical system can communicate its state in a manner that prevents an eavesdropper from accurately learning the state.