Secret Key Generation Via Localization and Mobility

TL;DR

This paper explores how localization information in mobile wireless networks can be used to generate secret keys, analyzing the theoretical limits and demonstrating the added security resource provided by localization data.

Contribution

It introduces a framework combining information theoretic secrecy with wireless localization, characterizing secret key rates based on localization noise and eavesdropper observations.

Findings

Localization information significantly enhances secret key generation.

Theoretical limits depend on observation noise variances.

Localization provides an additional resource for secure communication.

Abstract

We consider secret key generation from relative localization information of a pair of nodes in a mobile wireless network in the presence of a mobile eavesdropper. Our problem can be categorized under the source models of information theoretic secrecy, where the distance between the legitimate nodes acts as the observed common randomness. We characterize the theoretical limits on the achievable secret key bit rate, in terms of the observation noise variance at the legitimate nodes and the eavesdropper. This work provides a framework that combines information theoretic secrecy and wireless localization, and proves that the localization information provides a significant additional resource for secret key generation in mobile wireless networks.