基于联盟区块链的V2G网络跨域认证技术研究

针对车辆到电网（Vehicle-to-Grid，V2G）网络所面临的安全威胁，分析了V2G多域网络架构，给出了一个适用于该架构的网络信任模型。基于联盟区块链提出一种V2G网络跨管理域认证方案，通过本域用户与外地域服务器以及外地域服务器与其域内用户的认证实现域间用户双向认证。该方案利用区块链所具有的不易篡改特性，在数字身份验证环节采用哈希算法减少方案中的签名与验证次数，提高了方案的效率和可扩展性。该认证方案中的签名采用基于身份的密码算法SM9，在适应性选择消息攻击下具有存在性不可伪造安全。

A Cross-Domain Authentication Technology Based on Consortium Blockchain in V2G Networks

In view of the security threats faced by the vehicle-to-grid (V2G) network, this paper analyzes the V2G multi-domain network architecture and presents a network trust model suitable for the architecture. Based on the consortium blockchain, a cross-domain V2G authentication scheme is proposed, which achieves inter-domain user mutual authentication through the authentication between the domain user and the foreign domain server, and between the foreign domain server and its intra-domain users. The scheme utilizes the non-tampering characteristic of the blockchain, and adopts a hash algorithm in the digital identity verification to reduce the number of signatures and verifications in the scheme, thereby improving the efficiency and scalability of the scheme. The signature in the authentication scheme adopts the identity-based cryptographic algorithm SM9, and has the existence of unforgeable security under the adaptive selection message attack.