Strategies for Securing Safety Messages with Fixed Key Infrastructure in Vehicular Network

Vehicular communications play a substantial role in providing safety in transportation by means of safety message exchange. Researchers have proposed several solutions for securing safety messages. Protocols based on a fixed key infrastructure are more efficient in implementation and maintain stronger security in comparison with dynamic structures. These protocols utilize zone partitioning to establish distinct key infrastructure under Certificate Authority (CA) supervision in different regions. Secure anonymous broadcasting (SAB) is one of these protocols that preserves most of security aspects but it has some deficiencies in practice. A very important issue is region change of a vehicle for its mobility. Changing regions leads to change of CA and necessity of having new key set to resume communication. In this paper, we propose solutions for informing vehicles about region change to obtain new key set before entering next region. This hinders attackers- intrusion, packet loss and lessons time delay. We also make key request messages secure by confirming old CA-s public key to the message, hence stronger security for safety message broadcasting is attained.

• Nasser Mozayani
• Maryam Barzegar
• Hoda Madani

• Secure broadcasting
• Certificate authority (CA)
• Key exchange
• Vehicular network.

[1] Yong Xi, Kewei Sha, Weisong Shi, Loren Schwiebert, Tao Zhang,
Enforcing Privacy Using Symmetric Random Key-Set in Vehicular
Networks, In Proceedings of the 8th International Symposium on
Autonomous Decentralized Systems (ISADS), March 2007
[2] X. Sun, X. Lin, and P.-H. Ho, Secure Vehicular Communications Based
on Group Signature and ID-based Signature Scheme, in Proceedings of
International Conference on Communications (ICC), June 2007.
[3] J. Guo, J.P. Baugh, and S. Wang, A Group Signature Based Secure and
Privacy-Preserving Vehicular Communication Framework, Proceedings
of the Mobile Networking for Vehicular Environments (MOVE)
workshop in conjunction with IEEE INFOCOM, May 2007.
[4] Christine Laurendeau and Michel Barbeau, Secure Anonymous
Broadcasting in Vehicular Networks, Proceedings of the 32nd IEEE
Conference on Local Computer Networks (LCN), October 2007
[5] M. Raya and J. P. Hubaux, Securing vehicular ad hoc networks, Journal
of Computer Security, Vol. 15, No. 1, pp. 39-68, 2007
[6] Zhang J., Ma L., Su W., Wang Y. Privacy-Preserving Authentication
Based on Short Group Signature in Vehicular Networks, Data, Privacy,
and E-Commerce, ISDPE, Nov 2007
[7] T. Leinmueller, L. Buttyan, JP Hubaux, F. Kargl, R. Kroh, P.
Papadimitratos, M. Raya, E. Schoch
SEVECOM - Secure Vehicle Communication, 15th IST Mobile and
Wireless Communication Summit Mykonos, June 2006.
[8] Yan G., Choudhary G., Weigle M. C., Olariu S. Providing VANET
Security through Active Position Detection, VANET-07, September
2007.
[9] Douligeris C., Serpanos D. N., Network Security Current Status and
Future Directions, Wiley-Interscience Publishing, chapter 1, IEEE 2007.
[10] Anjum F, Mouchtaris P, Security For Wireless Ad Hoc Networks,
Wiley-Interscience Publishing, chapter 8, IEEE 2007.
[11] C. Harsch, A. Festag, and P. Papadimitratos, Secure Position-Based
Routing for VANETs, 2007 IEEE 66th Vehicular Technology
Conference (VTC 2007), September 2007.
[12] ITU-T Recommendation X.843, Information technology - Security
techniques -Specification of TTP services to support the application of
digital signatures, 2000.
[13] IEEE Vehicular Technology Society, 5.9 GHz Dedicated Short Range
Communications(DSRC)- Overview, (Online):Available:http://grouper
.ieee.org/ \groups/scc32/dsrc/.