Abstract
With the change of the network communication environment in vehicular ad hoc networks (VANETs) of a smart city, vehicles may encounter security threats such as eavesdropping, positioning, and tracking, so appropriate anonymity protection is required. Based on the certificateless cryptosystem and group signature ideas, this paper proposes a certificateless group signature anonymous authentication scheme for the VANETs of a smart city. In this scheme, it can implement the process of adding, signing, verifying, and revoking group members only by simple multiplication of the elliptic curve and synchronization factor technology, which shortens the length of the signature and improves the efficiency of the signature. From the proofs of correctness and security, we know that it does not only has anonymity and traceability of the group signature scheme but also has unforgeability and forward security. According to the performance verification, this scheme has lower calculation overhead and higher authentication efficiency.
Highlights
Vehicular ad hoc networks (VANETs) [1] of a smart city, as a typical application of the Internet of ings technology, enable real-time traffic information interaction between vehicles and vehicles and between vehicles and the infrastructure
The public key infrastructure- (PKI-) based public key certificate scheme proposed by Raya and Hubaux [1] in 2007 was mainly used. is scheme requires a large number of public-private key pairings and related certificates to be stored in the vehicles
The current certificateless group signature schemes are implemented with the help of bilinear pairing operations, which increases the overhead of the system operation. erefore, this paper proposes a certificateless group signature scheme based on elliptic curves, which uses elliptic curves instead of bilinear pairings for operations
Summary
Vehicular ad hoc networks (VANETs) [1] of a smart city, as a typical application of the Internet of ings technology, enable real-time traffic information interaction between vehicles and vehicles and between vehicles and the infrastructure. Zhao [7] proposed a revocable group signature scheme based on the Chinese remainder theorem in VANETs. When members join and revoke, they only need to regenerate a new group public key without changing the key pairings of other members, improving the efficiency of member joining and revoking. Certificateless group signature schemes applied to VANETs have been proposed [11,12,13,14,15,16,17], which has become a hotspot in the security of VANETs. Zhang et al [12] and Chen et al [14] used bilinear pairings to study the application of the certificateless group signature in VANETs, avoiding the problem of key escrow, without the need for certificate management, effectively reducing the system storage load. The group synchronization factor and group members’ synchronization factor are calculated and modified, which greatly reduces the calculation steps when group members join and revoke
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