车联网中支持直接撤销的外包属性签名方案

Outsourced attribute-based signature scheme with direct revocationsupport for vehicular Ad hoc network

数字签名在应对车联网中数据窜改威胁时扮演着重要作用,然而现有的签名方案在灵活性、效率、隐私保护、用户密钥管理等方面存在诸多问题,难以在车联网中释放其潜力。针对这些问题,提出了一个面向车联网的直接可撤销外包属性签名方案。该方案使用了基于线性秘密分享的签名策略机制,赋予车联网用户在签名生成和验证方面的灵活性和隐私保护。此外,设计了一种高效的用户密钥直接撤销机制,以提供对用户的实时撤权。所提方案还构造了一种外包验证方法,从而显著降低了验证者的计算和存储开销。安全性分析结果表明,所提方案在选择消息攻击下具有不可伪造性,并且能够抵抗合谋攻击。实验结果表明了该方案相较于其他方案的优势及其在车联网中的实用性。

Digital signatures play a critical role in addressing the threat of data tampering in VANET.However,existing signature solutions face numerous challenges,including flexibility,efficiency,privacy preservation,and user key management,which restrict their potential in VANET.To address these issues,this paper proposed a VANET-oriented directly revocable outsourced attribute-based signature scheme.The scheme employed a signature-policy mechanism based on the linear secret sharing scheme(LSSS),endowing VANET users with flexibility and privacy preservation in signature generation and verification.Furthermore,the proposed scheme designed an efficient direct revocation mechanism to provide real-time revocation of users and their keys.This scheme also constructed an outsourced verification approach for significantly reducing computational and storage overhead for verifiers.The security analysis results show that the proposed scheme is unforgeable under chosen message attacks and is resistant to collusion attacks.Experimental results demonstrate the advantages of the proposed scheme over other related schemes and its practicality for VANET.