Transmitter Actions for Secure Integrated Sensing and Communication

TL;DR

This paper models a secure integrated sensing and communication system as a wiretap channel with action-dependent states and feedback, deriving secrecy and rate regions for different channel conditions.

Contribution

It introduces a novel model for secure ISAC systems with transmitter actions affecting channel states and provides capacity regions for various scenarios.

Findings

Secrecy-distortion regions are characterized for physically-degraded channels.

Rate regions are derived when the entire message is kept secret.

Binary example illustrates the theoretical results.

Abstract

This work models a secure integrated sensing and communication (ISAC) system as a wiretap channel with action-dependent channel states and channel output feedback, e.g., obtained through reflections. The transmitted message is split into a common and a secure message, both of which must be reliably recovered at the legitimate receiver, while the secure message needs to be kept secret from the eavesdropper. The transmitter actions, such as beamforming vector design, affect the corresponding state at each channel use. The action sequence is modeled to depend on both the transmitted message and channel output feedback. For perfect channel output feedback, the secrecy-distortion regions are provided for physically-degraded and reversely-physically-degraded secure ISAC channels with transmitter actions. The corresponding rate regions when the entire message should be kept secret are also provided. The results are illustrated through characterizing the secrecy-distortion region of a binary example.