基于区块链的V2G无证书环签密隐私保护方案

doi:10.19678/j.issn.1000-3428.0065767

摘要/Abstract

摘要： 为实现车辆到电网(V2G)系统中车辆用户交易信息隐私保护和通信消息安全传输，提出一种基于区块链的无证书环签密隐私保护方案。在交易阶段采用无证书环签密对服务数据进行加密，减少签密过程中的双线性配对运算与指数运算，同时引入聚合签名技术降低签名验证的计算开销。在交易完成后将记录的服务数据与交易账单聚合为交易数据，将交易数据哈希、服务数据的环签密以及交易编号返回至区块链进行存储，而完整交易数据由云服务器存储，用户需要提供交易数据对应的环签密及交易编号，并通过智能合约完成对交易数据的访问。在随机预言模型下，通过安全分析来验证该方案的匿名性、可认证性、机密性和不可伪造性。实验结果表明，相较3种对比方案，该方案的计算开销具有明显优势，在签名数量增加到50个时，其聚合签名验证的计算开销减少近50%，同时能保证数据的机密性和成员通信的匿名性，有效提高V2G网络中的通信效率。

关键词: V2G网络, 无证书密码体制, 环签密, 区块链, 隐私保护

Abstract: A blockchain-based certificateless ring signature privacy protection scheme is proposed to ensure the privacy protection of vehicle user transaction information and secure transmission of communication messages in the Vehicle-to-Grid（V2G） system.To reduce bilinear pairing and exponential operations in the signcryption process，the service data are encrypted using a certificateless ring signature during the transaction process. Concurrently，aggregation signature technology is introduced to reduce the computational cost of signature verification.After the transaction is complete，the recorded service data and transaction bill are combined into transaction data，and the transaction data hash，service data ring signature key，and transaction number are stored on the blockchain.The complete transaction data are stored on the cloud server，and users need to provide the corresponding ring signature key and transaction number to access the transaction data，which is completed through smart contracts.Under the random oracle model，the security analysis is used to verify the anonymity，authenticability，confidentiality，and unforgeability of the scheme.The experimental results show that compared to the three comparison schemes，this scheme has significant computational advantages.When the number of signatures increases to 50，the computational overhead of aggregate signature verification decreases by nearly 50%，ensuring the confidentiality of data and anonymity of member communication，thus improving communication efficiency in the V2G networks.

Key words: V2G network, certificateless cryptography, ring signcryption, blockchain, privacy protection

中图分类号:

TP309

陈福安, 柳毅. 基于区块链的V2G无证书环签密隐私保护方案[J]. 计算机工程, 2023, 49(6): 34-41,52.

CHEN Fuan, LIU Yi. Blockchain-based V2G Certificateless Ring Signcryption Privacy Protection Scheme[J]. Computer Engineering, 2023, 49(6): 34-41,52.

https://www.ecice06.com/CN/Y2023/V49/I6/34

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