In the Internet of Vehicles (IoV) domain, the collection of traffic data is executed by intelligent devices and stored within a cloud-assisted IoV system. However, ensuring confidentiality and authorized access to data are the main problems of data storage. To address these problems, this paper proposes an efficient heterogeneous online/offline certificateless signcryption with a proxy re-encryption scheme (HOOCLS-PRE). This scheme enables IoV nodes in a certificateless cryptosystem (CLC) environment to store encrypted IoV-related data in the cloud. When an authorized user from an identity-based cryptosystem (IBC) wishes to access the data, the IoV node delegates the task of re-encrypting the data to the cloud, and only an authorized user can decrypt the data and verify its integrity and authenticity. The cloud cannot obtain any plaintext details about the data. In the proposed scheme, the signcryption process is split into offline and online phases. Most heavy computations are conducted without knowledge of the message during the offline phase. Only light computations are performed in the online phase when a message is available. The scheme protects the privacy and anonymity of vehicles by preventing adversaries from linking vehicle identities and locations. Moreover, a formal security proof is provided in the random oracle model. Finally, the performance analysis reveals that HOOCLS-PRE outperforms existing relevant schemes. Hence, HOOCLS-PRE is ideal for cloud-assisted IoV environments.

中文翻译：

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车联网高效异构在线/离线匿名无证书签密代理重加密


在车联网（IoV）领域，交通数据的收集由智能设备执行并存储在云辅助的车联网系统中。然而，确保数据的机密性和授权访问是数据存储的主要问题。为了解决这些问题，本文提出了一种高效的异构在线/离线无证书签密代理重加密方案（HOOCLS-PRE）。该方案使得无证书加密系统（CLC）环境中的车联网节点能够在云端存储加密的车联网相关数据。当基于身份的密码系统（IBC）的授权用户希望访问数据时，车联网节点将重新加密数据的任务委托给云端，只有授权用户才能解密数据并验证其完整性和真实性。云无法获取有关数据的任何明文详细信息。在所提出的方案中，签密过程分为离线和在线阶段。大多数繁重的计算是在离线阶段在不知道消息的情况下进行的。当消息可用时，在线阶段仅执行少量计算。该方案通过防止对手链接车辆身份和位置来保护车辆的隐私和匿名性。此外，随机预言模型中提供了形式化的安全证明。最后，性能分析表明HOOCLS-PRE优于现有的相关方案。因此，HOOCLS-PRE 是云辅助车联网环境的理想选择。