public key infrastructure is the most viable mechanism for securing VANETs as it can meet most VANET security requirements. However, PKI cannot provide certain security requirements such as location privacy, efficient authentication, and distributed and fair revocation .
• To revoke a vehicle in PKI, a CRL has to be issued by the TA (i.e., centralized revocation) and broadcast by the infrastructure RSUs. The network scale of VANETs is expected to be very large. Hence, the distribution of CRLs is prone to long delays. In addition, during the early deployment of VANETs, it is expected that RSUs will be sporadically distributed in the network. In practice, revocation of misbehaving vehicles should take place as fast as possible to prevent these vehicles from jeopardizing the safety of other vehicles.
• According to DSRC, each vehicle has to broadcast a message, which includes its current position, speed, and other telematic information, every 300 ms. In such a scenario, each vehicle may receive a large number of signed messages every 300 ms. The ability for each vehicle to check CRL for a large number of certificates and verify the senders’ signatures on the received messages in a timely manner forms an inevitable challenge to VANETs, especially in the context of PKI where these processes may take a long time. Hence, there is a necessity for mechanisms that can accelerate the authentication in PKI to ensure reliable VANETs.
The above mentioned CRL related issues can be resolved if size of CRL is reduced to linear having single entry for each revoked vehicle. Also decentralize revocation system can allow instant revocation of misbehaving without waiting for receiving updated revocation list from CA.
We intent to make certificates of vehicle linkable when it is revoked. All certificates of revoked vehicle are linkable through a linking value which is a linking public key. The CRL will have single linking public key value against each vehicle resulting linear complexity and size of CRL.
The linking value of vehicle is disclosed in result of a voting procedure where vehicles with valid shares from CA can only participate. And the linking value only links the certificates of the revoked vehicle keeping the user anonymous. Therefore, in case of unfair revocation the privacy of vehicle is not violated.
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