XYZ Privacy

TL;DR

XYZ Privacy introduces a novel mechanism allowing autonomous vehicle data to be privatized through contradictory responses, maintaining utility and security, thus enabling privacy-preserving data sharing in IoT transportation systems.

Contribution

The paper presents XYZ Privacy, the first mechanism enabling contradictory data responses with preserved utility, scalable implementation, and enhanced cryptographic primitives for secure vehicle data privacy.

Findings

Enables location data obfuscation with utility preservation

Uses Function Secret Sharing for non-attributable writes

Achieves an order of magnitude improvement in cryptographic efficiency

Abstract

Future autonomous vehicles will generate, collect, aggregate and consume significant volumes of data as key gateway devices in emerging Internet of Things scenarios. While vehicles are widely accepted as one of the most challenging mobility contexts in which to achieve effective data communications, less attention has been paid to the privacy of data emerging from these vehicles. The quality and usability of such privatized data will lie at the heart of future safe and efficient transportation solutions. In this paper, we present the XYZ Privacy mechanism. XYZ Privacy is to our knowledge the first such mechanism that enables data creators to submit multiple contradictory responses to a query, whilst preserving utility measured as the absolute error from the actual original data. The functionalities are achieved in both a scalable and secure fashion. For instance, individual location data can be obfuscated while preserving utility, thereby enabling the scheme to transparently integrate with existing systems (e.g. Waze). A new cryptographic primitive Function Secret Sharing is used to achieve non-attributable writes and we show an order of magnitude improvement from the default implementation.