Wenmao Liu Harbin Institute of Technology China
Mar 27, 2015
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