VANETs中通信有效的门限匿名认证方案

摘要

在保证可靠性、匿名性和可审核性的同时，提高执行效率和降低通信成本是车载自组织网络( VANETs)的研究热点。针对现有匿名认证方案计算量较大和通信成本较高的问题，提出一种通信有效的门限匿名认证方案。采用基于身份的签名算法提高执行效率，使原始信息可从签名中恢复，从而降低通信成本，利用门限转发机制实现信息的可靠性，使用假名保证发送者的匿名性，通过追踪和撤销机制实现可审核性。分析结果表明，与已有的门限匿名认证方案相比，该方案在保证安全性的同时，具有较低的通信成本和较高的执行效率。%How to improve the computational efficiency and how to reduce the communication cost while achieving the goals of reliability, anonymity and auditability are becoming important research issues of Vehicular Ad Hoc Networks (VANETs). Due to computational efficiency and communication cost of existing anonymous authentication schemes,a communication-efficient threshold anonymous authentication scheme is proposed in this paper. It signs the message by using an identity-based signature algorithm and the original message can be recovered from the signature, which can improve the computational efficiency and reduce the communication cost. The threshold-based forwarding mechanism ensures reliability of information. The anonymity of the message sender is achieved by using pseudonym. In order to achieve auditability,this system is able to track and revoke malicious nodes. Analysis result indicates that the proposed scheme not only satisfies reliability, anonymity and auditability, but also has lower communication cost and better computational efficiency compared with the existing threshold anonymous announcement in VANETs.