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A secure and efficient decentralized access control scheme based on blockchain for vehicular social networks

Zhang, L., Zhang, Y., Wu, Q., Mu, Y. and Rezaeibagha, F. (2022) A secure and efficient decentralized access control scheme based on blockchain for vehicular social networks. IEEE Internet of Things Journal . Early Access-1.

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The vehicular social network (VSN) is an emerging mobile communication system combining a vehicle ad hoc network (VANET) with a social network. It provides a new means of sharing, disseminating, and delivering data for passengers, drivers, and vehicles. However, a VSN may expose users’ private information, such as identities, location information, and trajectories, and tampering with shared data may lead to security and safety problems in vehicle systems. Considering the security and privacy-preservation of shared data, we propose a lightweight decentralized multi-authority access control scheme based on ciphertext-policy attribute-based encryption (CP-ABE) and blockchain, by which a decentralized multi-authorization node supports vehicle users by performing lightweight calculations with the assistance of the vehicle cloud service provider (VCSP). We use blockchain to record storage and access transactions, achieving self-verification by users and tamper-resistance of ciphertexts. An improved smart contract reduces the workload of verification by users and achieves privacy preservation by hiding the policy. It supports user revocation and outsourced decryption, enabling more flexibility and better performance. A security and performance analysis shows that our scheme has clear advantages over existing schemes.

Item Type: Journal Article
Murdoch Affiliation(s): IT, Media and Communications
Publisher: IEEE
Copyright: © 2022 IEEE
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