Research On Aggregate Signature Authentication Scheme In Vehicular Ad-hoc Networks

The Vehicular Ad Hoc Network is a type of mobile ad hoc network,which supports vehicle-to-vehicle(V2V)and vehicle-to-infrastructure(V2I)communications.Self-organizing,distributed networks and highly dynamic topologies are three important features of VANETs.The characteristics of VANETs and their application in road safety have attracted great interest from industry and academia.It has important research significance in improving traffic management systems,controlling traffic flow and improving user driving.Before the deployment of these applications,information security and user privacy protection in the network must be solved.The Aggregate Signature Authentication Protocol supports both identity and privacy protection.Therefore,it is designed to address security and proprietary protection issues in VANETs.The aggregate signature authentication protocols that have been proposed in recent years mainly use complex cryptographic operations such as bilinear mapping,resulting in reduced efficiency of protocol operation.Other protocols are not able to withstand multiple security attacks in VANETs,such as attacks,message tampering attacks,and so on.In this article,we improves the traditional CLASA certification scheme and proposes a Security Enhanced CLASA(SE-CLASA)protocol.First,we design the system security model based on the random oracle as the security basis of the protocol.Then we improve the efficiency and security of the protocol from the following three aspects: conditional privacy protection,signature aggregation algorithm and signature aggregation security.The trust center generates pseudonyms for vehicles,which broadcast traffic-related information to the network to realize conditional privacy protection.The roadside unit uses the aggregation signature algorithm to aggregates the signatures of multiple messages into a short signature for authentication.As for the malicious message injection attack,which exists in the process of aggregate signature verification,we designed a "factor-included verification of aggregate signature" mechanism to resist this attack and enhance the security of the protocol.We uses the random oracle model to design the security model to prove the security of our protocol and proves that it can meet the known security requirements in the VANETs scenario.Performance analysis shows that,compared with the mainstream CLASA scheme in VANETs,SE-CLASA has faster calculation speed,lower communication overhead and higher execution efficiency,which is more suitable for the short-distance real-time communication scenario in VANETs.