ITS & VANETs Intelligent Transportation Systems(ITS) Systems adding information and communications technology to transport infrastructure and vehicles. Vehicular Ad-Hoc Networks(VANETs) Subset of MANETs Vehicles talk to each other and the road side infrastructures with wireless devices Intelligent ?
Benefits of VANETs Congestions : reduced Accidents : avoided
Benefit of VANETs Improve entertainment WIFI access Online music Real time position Find restaurants …
Security Issues Driving is a life-or-death matter Many attackers for many purposes Terrorists Crackers Message Blockers Illusion makers
Vehicle authentication Authentication process of a vehicle o to a roadside infrastructure r. r broadcasts its certificate. o verifies rs certificate. o challenges r and sends its own certificate as piggyback to save time r verifies os identity, and then answers the challenge o 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 os validity by checking the response
Secure Communication Pseudonym scope Certificate Cache & Forward T cache = Length/ Speed n Length = (r 2 (d mn sin ) 2 + d mn 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