Joint Source-Channel Secrecy Using Hybrid Coding

TL;DR

This paper investigates secure lossy source transmission over noisy broadcast channels, demonstrating that hybrid coding schemes outperform separate coding in secrecy and fidelity performance.

Contribution

It introduces and analyzes hybrid coding schemes for joint source-channel secrecy, showing their superiority over traditional separate coding methods.

Findings

Hybrid coding schemes outperform separate schemes in secrecy performance.

Hybrid schemes achieve better fidelity at the legitimate receiver.

Numerical examples confirm the advantages of hybrid coding in practical scenarios.

Abstract

The secrecy performance of a source-channel model is studied in the context of lossy source compression over a noisy broadcast channel. The source is causally revealed to the eavesdropper during decoding. The fidelity of the transmission to the legitimate receiver and the secrecy performance at the eavesdropper are both measured by a distortion metric. Two achievability schemes using the technique of hybrid coding are analyzed and compared with an operationally separate source-channel coding scheme. A numerical example is provided and the comparison results show that the hybrid coding schemes outperform the operationally separate scheme.