一种条件隐私保护的V2G无证书高效聚合签密方案  

Efficient certificateless aggregate signcryption scheme with conditional privacy protection for V2G networks

作　　者：刘洁 范馨月[1] 何嘉辉 LIU Jie;FAN Xinyue;HE Jiahui(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《电信科学》2024年第9期88-98,共11页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.62271096)。

摘　　要：针对无证书签名方案不能满足消息机密性,大多数签密方案又存在安全功能不完善、效率低等问题,基于椭圆曲线加密技术提出一种适用于车辆到电网(vehicle-to-grid,V2G)的无证书聚合签密方案。车辆的部分公私钥由自身生成,避免了密钥托管问题。本地聚合器通过聚合解签密,提高了验证效率。通过假名机制提供条件隐私保护,保证合法车辆的匿名性与对恶意车辆的追溯和撤销。采用二元多项式实现车辆假名自主更新。在随机预言机模型下,证明了方案在自适应选择密文攻击下满足不可区分性(IND-CCA2),在自适应选择消息攻击下存在不可伪造性(EUF-CMA)。Scyther形式化分析工具证明了方案的安全性。性能分析表明,与近年签密方案相比,所提方案平均减少了约12.9%的通信开销和84.4%的聚合解签密计算开销,同时具有更高的安全要求。To address the issue of message confidentiality in certificateless signature schemes and the shortcomings of most signcryption schemes,such as incomplete security functions and low efficiency,a certificateless aggregate signcryption scheme based on elliptic curve encryption technology was proposed for vehicle-to-grid(V2G)networks.Part of the vehicle’s public and private keys were generated by the vehicle itself,avoiding the problem of key escrow.Verification efficiency was improved by the local aggregator through aggregate unsigncryption.Conditional privacy protection was provided by a pseudonym mechanism,ensuring the anonymity of legitimate vehicles and the traceability and revocation of malicious vehicles.Binary polynomials were used to achieve autonomous updating of vehicle pseudonyms.In the random oracle model,the scheme was proven to meet indistinguishability under adaptive chosen ciphertext attacks(INDCCA2)and existential unforgeability under adaptive chosen message attacks(EUF-CMA).The security of the scheme was verified by the Scyther formal analysis tool.Performance analysis shows that,compared to recent signcryption schemes,the proposed scheme achieves an average reduction of approximately 12.9%in communication overhead and 84.4%in aggregate unsigncryption computation costs,while also meeting higher security requirements.

关 键 词：无证书 条件隐私保护 二元多项式 聚合签密 可撤销性 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]