wenmao liu harbin institute of technology china. outline its & vanets security issues and...
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Wenmao Liu
Harbin Institute of Technology
China
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Outline
ITS & VANETs Security Issues and Solutions An autonomous architecture Conclusion
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Problems in current TS
Congestions Accidents
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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 ?
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Benefits of VANETs
Congestions : reduced
Accidents : avoided
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Benefit of VANETs
Improve entertainmentWIFI accessOnline musicReal time positionFind restaurants …
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Security Issues
Driving is a life-or-death matter Many attackers for many purposes
TerroristsCrackersMessage BlockersIllusion makers
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Solutions
Cryptography Intrusion Detection Authentication (PKI) Pseudonym (fake ID)
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Scenario
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An autonomous architecture
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An autonomous architecture Servers
CA clustersLog serversApplication Servers
Roadside infrastructures Vehicles
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Autonomous system setup Node deployment Backbone node generation Autonomous gather
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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
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Secure Communication
Pseudonym scope Certificate Cache & Forward
Tcache = Length/ Speedn
Length = (r2 − (dmn sin )2 + dmn cos α)1/2
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Conclusion
ITS and VANETs offer promising future for transportation.
Reducing overheads of roadside infrastructures
A complete authentication Regional trust relationship and
autonomy guarantee scalability
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The End