Conditional Privacy-Preserving Authentication Protocols for Vehicular Ad Hoc Networks
by Jiliang Li
Date of Examination:2019-05-17
Date of issue:2019-06-12
Advisor:Prof. Dr. Dieter Hogrefe
Referee:Prof. Dr. Dieter Hogrefe
Referee:Prof. Dr. Marcus Baum
Referee:Prof. Dr. Yusheng Ji
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Abstract
English
The Conditional Privacy-Preserving Authentication (CPPA) protocol has applications in the construction of secure Vehicular Ad hoc Networks (VANETs) due to its capability to achieve both privacy preservation and authentication simultaneously. Although a number of CPPA protocols have been proposed in the literature, existing approaches generally suffer from limitations such as the security problem of system private keys, high computation requirement during certificate generation and message verification phases. To resolve these issues, this thesis firstly presents a Certificateless and Provably-Secure Conditional Privacy-Preserving Authentication (CPS-CPPA) protocol for VANETs based on the Tamper-Proof Device (TPD). To improve efficiency further, the proposed CPS-CPPA scheme added the function of batch verification. However, this thesis has found out that the CPS-CPPA protocol cannot guarantee the secrecy of one master key in practice and not withstand the forged message attack and impersonation attack. To overcome the vulnerabilities of CPS-CPPA protocol, this thesis presents an Enhanced, Certificateless and Provably-Secure Conditional Privacy-Preserving Authentication (ECPS-CPPA) protocol to be used in vehicular environments that supports both privacy and security requirements in the VANETs system. This thesis also demonstrates that the ECPS-CPPA protocol is secure against forged message attack, impersonation attack, and other existing attacks. A comparative summary shows that our ECPS-CPPA protocol has favorable computation and communication overheads in comparison to the other two recently published protocols. In the future, it is important to implement a proof of concept of this protocol in order to evaluate the real-world utility of ECPS-CPPA protocol.
Keywords: Privacy-preserving; Authentication; Vehicular Ad hoc Networks; Anonymity; Traceability