Cooperative Location Privacy in Vehicular Networks: Why Simple Mix-zones are not Enough

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Khodaei, MohammadKTH,Nätverk och systemteknik,Networked Systems Security group (författare)

Cooperative Location Privacy in Vehicular Networks : Why Simple Mix-zones are not Enough

Artikel/kapitelEngelska2021

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Institute of Electrical and Electronics Engineers Inc.2021
electronicrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:kth-290827
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290827URI
https://doi.org/10.1109/JIOT.2020.3043640DOI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:art swepub-publicationtype

Anmärkningar

QC 20210323
Vehicular communications disclose rich information about the vehicles and their whereabouts. Pseudonymous authentication secures communication while enhancing user privacy. To enhance location privacy, cryptographic mix-zones were proposed to facilitate vehicles covertly transition to new ephemeral credentials. The resilience to (syntactic and semantic) pseudonym linking (attacks) highly depends on the geometry of the mix-zones, mobility patterns, vehicle density, and arrival rates. We introduce a tracking algorithm for linking pseudonyms before and after a cryptographically protected mix-zone. Our experimental results show that an eavesdropper, leveraging standardized vehicular communication messages and road layout, could successfully link ≈73% of pseudonyms during non-rush hours and ≈62% of pseudonyms during rush hours after vehicles change their pseudonyms in a mix-zone. To mitigate such inference attacks, we present a novel cooperative mix-zone scheme that enhances user privacy regardless of the vehicle mobility patterns, vehicle density, and arrival rate to the mix-zone. A subset of vehicles, termed relaying vehicles, are selected to be responsible for emulating non-existing vehicles. Such vehicles cooperatively disseminate decoy traffic without affecting safety-critical operations: with 50% of vehicles as relaying vehicles, the probability of linking pseudonyms (for the entire interval) drops from ≈68% to ≈18%. On average, this imposes 28 ms extra computation overhead, per second, on the Road-Side Units (RSUs) and 4.67 ms extra computation overhead, per second, on the (relaying) vehicle side; it also introduces 1.46 KB/sec extra communication overhead by (relaying) vehicles and 45 KB/sec by RSUs for the dissemination of decoy traffic. Thus, user privacy is enhanced at the cost of low computation and communication overhead.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Anonymity
Location Privacy
Mix Networks
Privacy
Pseudonymity
VANETs.
Vehicular Communication
Cryptography
Privacy by design
Roads and streets
Safety engineering
Semantics
Communication overheads
Cooperative locations
Critical operations
Extra computations
Inference attacks
Tracking algorithm
Vehicular communications
Vehicular networks
Road vehicles

Biuppslag (personer, institutioner, konferenser, titlar ...)

Papadimitratos, PanagiotisKTH,Kommunikationssystem, CoS,Networked Systems Security group(Swepub:kth)u1ysvc1i (författare)
KTHNätverk och systemteknik (creator_code:org_t)

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Ingår i:IEEE Internet of Things Journal: Institute of Electrical and Electronics Engineers Inc., s. 1-12327-4662

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Elektroteknik oc ...

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