Improving Unlinkability in C-ITS: A Methodology For Optimal Obfuscation
Publikation: Beitrag in Buch/Konferenzbericht/Sammelband/Gutachten › Beitrag in Konferenzband › Beigetragen › Begutachtung
Beitragende
Abstract
In this paper, we develop a new methodology to provide high assurance about privacy in Cooperative Intelli gent Transport Systems (C-ITS). Our focus lies on vehicle-to-everything (V2X) communications enabled by Cooperative Awareness Basic Service. Our research motivation is developed based on the analysis of unlinkability provision methods indicating a lack of such methods. To address this, we propose a Hidden Markov Model (HMM) to express unlinkability for the situation where two vehicles are communicating with a Roadside Unit (RSU) using Cooperative Awareness Messages (CAMs). Our HMM has labeled states specifying distinct origins of the CAMs observable by a passive attacker. We then establish that high assurance about the degree of uncertainty (e.g.. entropy) about labeled states can be obtained for the attacker under the assumption that he knows actual positions of the vehicles (e.g.. hidden states in HMM). We further demonstrate how unlinkability can be increased in C-ITS: we propose a joint probability distribution that both drivers must use to obfuscate their actual data jointly. This obfuscated data is then encapsulated in their CAMs. Finally, our findings are incorporated into an obfuscation algorithm whose complexity is linear in the number of discrete time steps in the HMM.
Details
Originalsprache | Englisch |
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Titel | ICISSP 2023 - Proceedings of the 9th International Conference on Information Systems Security and Privacy |
Redakteure/-innen | Paolo Mori, Gabriele Lenzini, Steven Furnell |
Herausgeber (Verlag) | Science and Technology Publications, Lda |
Seiten | 677-685 |
Seitenumfang | 9 |
ISBN (Print) | 9789897586248 |
Publikationsstatus | Veröffentlicht - 2023 |
Peer-Review-Status | Ja |
Extern publiziert | Ja |
Publikationsreihe
Reihe | International Conference on Information Systems Security and Privacy (ICISSP) |
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Konferenz
Titel | 9th International Conference on Information Systems Security and Privacy |
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Kurztitel | ICISSP 2023 |
Veranstaltungsnummer | 9 |
Dauer | 22 - 24 Februar 2023 |
Webseite | |
Stadt | Lisbon |
Land | Portugal |
Externe IDs
ORCID | /0000-0002-0466-562X/work/159607940 |
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Schlagworte
ASJC Scopus Sachgebiete
Schlagwörter
- Cybersecurity, Entropy, Hidden Markov Model, Obfuscation, Privacy, Unlinkability, V2X