Integrating group signature scheme with Non-transitive Proxy Re-encryption in VANET

Vehicular Ad hoc Network (VANET), using IEEE 802.11p, forms an ad hoc network of vehicles with no additional infrastructure to provide security and convenience to the drivers. The network delivers the traffic related information to the vehicles commencing the inter-vehicular communication (IVC), considering driver's context awareness and sensitivity. Rather than moving in random fashion as in other ad hoc networks, vehicles move in an organized way. Since all the vehicles on road need to be equipped with message transmission capabilities, the realistic scenario of VANET is often canvassed. Secure routing and smooth operation are even more questionable. This research work aims to enhance security by integrating group signature with Non-transitive Proxy Re-encryption technique. Proxy re-encryption is a cryptographic technique which allows a third party to re-encrypt the message in such a way that it can decrypted by other authorized people as well, along with the person for which the message was originally sent. Non-transitiveness of the algorithm makes sure that proxy is not able to generate re-encryption key, rk_A→C given rk_A→B and rk_B→C. This framework benefits the network in two possible ways: First, the message sent in group can be read by either member of the group or the groups which are allowed to read the message specifically using re-encryption technique. Second, even if the proxy is compromised, C cannot decrypt A's message if the re-encryption rights were given only for B.