An essential goal of the Internet of Vehicles (IoV) is to allow vehicles’ peer connections and contact a service provider through a secure communication channel. However, privacy and authentication are considered the main objectives of secure communication. In this paper, we propose an efficient Online/Offline signcryption of heterogeneous systems based on blockchain to secure data sharing between the IoV and internet servers. The blockchain prevents tampering with compatibility information. Further, the smart contract addresses the weakness of internet servers, such as passing incorrect data to the IoV nodes. The proposed protocol satisfies the security requirements of IoV, such as integrity, authentication, unforgeability, and confidentiality in a single logical step. We introduce the construction of our Efficient Heterogeneous Signcryption Scheme for Internet of Vehicles (EHSC-IoV) and verify that our protocol is secure under the Discrete Logarithm (DL) and the Computational Diffie–Hellman (CDH) assumptions. As compared with the existing five heterogeneous signcryption schemes, the performance evaluation and simulation results show that the computational cost of the IoV nodes in our protocol reduced by about \( 75\%,84.2\%,80\%, 67.9\%\), and \( 82.4\%\), respectively, and the total energy consumption of the IoV nodes in our protocol reduced by about \( 69.4\%, 75.4\%, 75.2\%, 62.3\%,\) and \( 75.1\% \), respectively.

车辆互联网（IoV）的基本目标是允许车辆的对等连接，并通过安全的通信渠道与服务提供商联系。但是，隐私和身份验证被视为安全通信的主要目标。在本文中，我们提出了一种基于区块链的异构系统的有效在线/离线签密算法，以保护IoV和Internet服务器之间的数据共享。区块链可防止篡改兼容性信息。此外，智能合约解决了Internet服务器的弱点，例如将错误的数据传递到IoV节点。所提出的协议在单个逻辑步骤中满足了IoV的安全性要求，例如完整性，身份验证，不可伪造性和机密性。我们介绍了我们的车联网高效异构签密方案（EHSC-IoV）的构建，并验证了我们的协议在离散对数（DL）和计算Diffie-Hellman（CDH）假设下的安全性。与现有的五种异构签密方案相比，性能评估和仿真结果表明，我们协议中的IoV节点的计算成本降低了约\（75 \％，84.2 \％，80 \％，67.9 \％\）和\（82.4 \％\），并且我们协议中IoV节点的总能耗减少了大约\（69.4 \分别为％，75.4 \％，75.2 \％，62.3 \％，\）和\（75.1 \％\）。