To provide a classification function that has the ability to promote the management of signcrypted messages transmitted by the numerous vehicles in the IoV system, in this paper, we construct an identity-based signcryption with equality test scheme (IBSC-ET) for the first time. Our scheme not only ensures the integrity, confidentiality as well as authentication of messages, but also enables the cloud server to execute the equality test between two ciphertexts signcrypted by the same or different public keys to decide whether the same plaintext is contained, which is counted as the essential factor contributing to the classification. Besides, the identity-based mechanism greatly improves the efficiency since the certificate management problem is avoided. Furthermore, the security of the introduced scheme can be proved in the random oracle model under the Computational Diffie-Hellman Assumption (CDHA) as well as the Bilinear Diffie-Hellman Assumption (BDHA). In the end, the feasibility and efficiency of our proposed are demonstrated through the performance analysis.

为了提供一种能够促进IoV系统中众多车辆传输的签密消息管理的分类功能，本文首次构建了基于身份的带有相等性测试方案的签密（IBSC-ET） 。我们的方案不仅可以确保消息的完整性，机密性和身份验证，还可以使云服务器执行由相同或不同的公共密钥签名的两个密文之间的相等性测试，以确定是否包含相同的明文。作为有助于分类的必要因素。此外，由于避免了证书管理问题，基于身份的机制大大提高了效率。此外，可以在计算Diffie-Hellman假设（CDHA）和双线性Diffie-Hellman假设（BDHA）下的随机预言模型中证明引入方案的安全性。最后，通过性能分析证明了本文提出方案的可行性和有效性。