【摘要】 车联网匿名身份认证技术是向用户提供有效服务的基础，能够保证车联网通信过程的安全性。针对现有的匿名身份认证方案在认证效率、计算开销等方面存在的不足，提出了一种基于CP-ABE和区块链的匿名身份认证算法。采用动态属性和静态属性相结合的认证策略，认证机构为车辆分配假名，实现了车联网中的细粒度匿名身份认证，减少冗余认证，提高时间效率，保护用户隐私。同时，结合区块链技术，对认证策略进行管理，防止身份认证过程中认证策略被恶意篡改。实验结果表明，该算法能够实现快速的加解密，满足车联网身份安全、高效认证的需求。更多还原

【Abstract】 Anonymous identity authentication technology in the IoV is the basis for providing effective services to users, which can ensure the security of the communication process in the IoV. In view of the existing anonymous authentication scheme in the certification of the defects in the aspects such as efficiency and computational overhead.To improve the efficiency and safety of the authentication of IoV, we design an anonymous authentication system based on CP-ABE and blockchain. It adopts the combination of dynamic and static attributes certification strategy and the authentication authority assigns pseudonyms to vehicles. It realizes fine-grained anonymous authentication in IoV, reduces redundant authentication, improves time efficiency and protects user’s privacy. Meanwhile,authentication policy is prevented from being maliciously tampered in the process of identity authentication by the blockchain. The experimental results show that the system can realize fast encryption and decryption, meet the demand of identity authentication in IoV.更多还原