Message Linkable Group Signature With Information Binding and Efficient Revocation for Privacy- Preserving Announcement in VANETs

In vehicular ad hoc networks (VANETs), the broadcasting of fake announcement messages by malicious vehicles can potentially misguide nearby vehicles. Ensuring the trustworthiness of announcement messages while preserving the privacy of vehicles is a significant challenge in the design of an announcement scheme for VANETs. To address this challenge, we propose a privacy-preserving announcement scheme with strong trustworthiness based on a new security tool called message linkable group signature with information binding and efficient revocation. Compared with the existing privacy-preserving announcement schemes, our proposed scheme not only achieves the traditional trustworthiness requirement of an announcement message but also provides strong trustworthiness, which makes it resistant to sybil and collusive attacks. To the best of our knowledge, our scheme realizes strong trustworthiness for the first time. Simulations were also performed to show the practicability of the scheme.