Global Revocation for the Intersection Collision Warning Safety Application

Sep 19, 2012

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Abstract

Identifying and removing malicious insiders from a network is a topic of
active research. Vehicular ad hoc networks (VANETs) may suffer from
insider attacks; that is, an attacker may use authorized vehicles to
attack other vehicles. Specifically, attackers may use their vehicles to
broadcast specially formed packets that will trigger warnings in target
vehicles. This malicious behavior could have a significant detrimental
effect on cooperative safety applications (SAs), one of the driving forces
behind VANET deployment.

We propose modifications to the intersection collision warning (ICW) SA
that enable a certificate authority (CA) to be offline and yet to decide
to revoke a vehicle's certificates using retransmitted information that
cannot repudiated. Our approach differs from previous proposals in that
it is SA specific, and it is resilient to Sybil attacks. We simulate and
measure the resources an attacker requires to attack a vehicle using the
ICW SA without our modifications and demonstrate that our additions reduce
the false positive rate arising from errors in estimated vehicle dynamics.