Wenmao Liu

Harbin Institute of Technology

China

Outline

ITS & VANETs Security Issues and Solutions An autonomous architecture Conclusion

Problems in current TS

Congestions Accidents

ITS & VANETs

Intelligent Transportation Systems(ITS)Systems adding information and

communications technology to transport infrastructure and vehicles.

Vehicular Ad-Hoc Networks(VANETs)Subset of MANETsVehicles talk to each other and the road side

infrastructures with wireless devicesIntelligent ?

Benefits of VANETs

Congestions : reduced

Accidents : avoided

Benefit of VANETs

Improve entertainmentWIFI accessOnline musicReal time positionFind restaurants …

Security Issues

Driving is a life-or-death matter Many attackers for many purposes

TerroristsCrackersMessage BlockersIllusion makers

Solutions

Cryptography Intrusion Detection Authentication (PKI) Pseudonym (fake ID)

Scenario

An autonomous architecture

An autonomous architecture Servers

CA clustersLog serversApplication Servers

Roadside infrastructures Vehicles

Autonomous system setup Node deployment Backbone node generation Autonomous gather

Vehicle authentication Authentication process of a vehicle o to a

roadside infrastructure r.r broadcasts its certificate .o verifies r’s certificate.o challenges r and sends its own certificate as

piggyback to save timer verifies o’s identity, and then answers the

challengeo checks whether the return message value

equal the challenge message, if yes, r is legal, vice versa. Then o calculates the challenge n and sends it back.

r verifies o’s validity by checking the response

Secure Communication

Pseudonym scope Certificate Cache & Forward

Tcache = Length/ Speedn

Length = (r2 − (dmn sin )2 + dmn cos α)1/2

Conclusion

ITS and VANETs offer promising future for transportation.

Reducing overheads of roadside infrastructures

A complete authentication Regional trust relationship and

autonomy guarantee scalability

The End