Abstract
It is a challenging issue to provide a secure and conditional anonymous authentication scheme in vehicle ad hoc networks (VANETs) with low storage space and computational cost. In 2008, Lu et al. proposed a conditional privacy preservation scheme called efficiency conditional privacy preservation (ECPP) protocol. The ECPP protocol provides conditional privacy preservation to vehicles in VANETs. That is, on one hand vehicles can achieve anonymous authentication in the network, on the other hand, allow to be traced and revoked if necessary. However, ECPP scheme suffers from high computational cost and large storage. In this scheme, an improved protocol based on the concept of ECPP protocol has been proposed to achieve more efficiency conditional privacy preservation (MECPP) scheme in VANETs. Comparing with ECCP, the computational cost of the proposed scheme has been decreased by about 54 % while the communication overhead has been reduced by about 10 % . At the same time, a lot of storage space has been saved.
Highlights
Many people are seriously injured or killed in road traffic accidents due to carelessness, traffic congestion, traffic violations, inadequate road information, increased population and lack of secure infrastructure
The system model of a single geographic region for the scheme is illustrated in System roles: vehicle ad hoc networks (VANETs) generally consist of vehicles equipped with wireless communication devices, which are called On Board Unit (OBU), infrastructure units such as Road Side Units (RSUs) which are located on the roadside or at a street intersection providing wireless interfaces to vehicles within their radio coverage, and a centralized Trusted Authority (TA) which is responsible for the RSU
We evaluate the computational cost for anonymous certificate and signature verification process with the prior related schemes such as efficiency conditional privacy preservation (ECPP) [10], Boneh Lynn Shacham (BLS) scheme [29], group signature based (GSB) scheme [8], certificateless aggregate signatures (CAS) [30] and key-insulated pseudonym self delegation (KPSD) scheme [31]
Summary
Many people are seriously injured or killed in road traffic accidents due to carelessness, traffic congestion, traffic violations, inadequate road information, increased population and lack of secure infrastructure. The overhead of authentication will increase linearly with the increase of CRLs. The higher overhead of identifying and revoking malicious vehicles makes group signature and identity-based signature (GSIS) [8] and hybrid method [9] unsuitable for real-time VANETs. Efficiency conditional privacy preservation (ECPP) [10], proposed by Lu et al, is a relatively practical scheme which deals with the growing revocation list while achieving conditional traceability by the authorities, but it suffers drawbacks: (1) It takes more latency time for sending and verifying the certificate and signature which are not efficient for the high speed movement of vehicles; (2) It needs large space to storage every vehicle’s temporary information to reveal the malicious vehicles when the tracking phases; (3) Vehicle will interact with infrastructure unit several times during short-time anonymous key generation.
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