A Study of Signcription with Group Signature Based Authentication in Vehicular Ad-hoc Network

Vehicular ad hoc networks are emerging as an effective technology for providing a wide range of safety applications to by-vehicle passengers. VANET is a special class of Mobile ADHOC Networks (MANET), in which the nodes are the vehicles which communicate with other vehicles or with the base station which acts as a roadside infrastructure for using security and services application. The most favorable target is the more useful, efficient and safer roads will built through vehicular networks by informing to basic authorities and drivers in time in the future. If a vehicle changes its certificate between two observation points controlled by an attacker while moving in the same lane and with the same speed on the road, an attacker can correlate the certificates used by that vehicle and hence track the vehicle. The proposed system overcomes the location privacy with the Signcryption is a new paradigm in public key cryptography. A remarkable property of a signcryption scheme is that it fulfills both the functions of public key encryption and digital signature, with a cost significantly smaller than that required by signature-then-encryption. The purposes of this paper are to demonstrate how to specify signcryption schemes and to examine the efficiency of such schemes. A signcryption is a primitive that provides private and authenticated delivery of messages between two parties. Proxy signature schemes are variations of ordinary digital signature schemes and have been shown to be useful in many applications. We proposed an identity-based signcryption scheme from the group signatures. Also we analyze the proposed scheme from efficiency and security points of view. Group signature is given for those security properties. We have shown that the signcryption scheme is as efficient as ordinary identity-based signcryption schemes under certain circumstances.