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Effective certificate distribution in ETSI ITS VANETs using implicit and explicit requests

: Bittl, Sebastian; Aydinli, Berke; Roscher, Karsten

Postprint urn:nbn:de:0011-n-3412215 (213 KByte PDF)
MD5 Fingerprint: 85394517c50697122cfbe00e59fcb301
The original publication is available at
Erstellt am: 10.06.2015

Kassab, Mohamed (Ed.):
Communication Technologies for Vehicles. 8th International Workshop, Nets4Cars/Nets4Trains/Nets4Aircraft 2015 : Sousse, Tunisia, May 6-8, 2015. Proceedings
Cham: Springer International Publishing, 2015 (Lecture Notes in Computer Science 9066)
ISBN: 978-3-319-17764-9 (Print)
ISBN: 978-3-319-17765-6 (Online)
International Workshop Nets4Cars/Nets4Trains/Nets4Aircraft <8, 2015, Sousse>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ESK ()
certificate distribution; VANET; ETSI ITS; security; automotive connectivity

Security and privacy of current Car-to-X systems heavily depends on the usage of pseudonym certificates. These carry the required information for authenticating messages received from other vehicles. However, only a limited amount of detailed studies about certificate distribution strategies in VANETs as well as attack surfaces of such systems has been proposed. Therefore, a general study about possible distribution mechanisms and their parametrization is provided in this work. Thereby, the management of entries in request lists is identified as a key issue for system performance. Additionally, a design flaw in the currently standardized ETSI ITS distribution scheme is outlined leading to the possibility of an attacker significantly increasing channel load on the safety critical control channel. A solution to this problem is suggested and an evaluation of its performance is provided. Furthermore, the evaluation shows the great influence of request list management on authentication delay and thus on security inducted packet loss.