车载自组网中可撤销的聚合签名认证方案

为解决车载自组网（VANET）面临的通信安全和隐私保护方面的问题，提出了一种车载自组网中可撤销的聚合签名认证方案。该方案通过匿名认证保障用户隐私，通过使用防篡改设备和聚合签名技术提高认证效率。为实现车辆撤销，要求车辆使用路边单元发放的成员密钥生成签名，当车辆进入路边单元的通信范围时，路边单元实时审查车辆身份，拒绝为撤销列表中的车辆发放成员密钥，使其无法生成合法签名。当仿真区域内各个进口道的输入车流量为每小时600辆时，相较于同类型的几种方案，该方案降低了至少33.77%的认证开销。仿真实验结果表明，该方案适用于资源受限的车载自组网环境。

Revocable aggregate signature authentication scheme for vehicular ad hoc networks

In order to address problems concerning communication security and privacy preservation in Vehicular Ad hoc Network （VANET）， a revocable aggregate signature authentication scheme for VANETs was proposed. For protecting user privacy and enhancing authentication efficiency， the proposed scheme utilized anonymous authentication， tamper-proof device and aggregate signature technique. For realizing vehicle revocation， the vehicle was required to generate signatures with member secret keys distributed by the Road-Side Unit （RSU）. The RSU would check the vehicle identity when the vehicle entered its communication scope， and it would not distribute member secret keys to vehicles in the revoke list. Thus， malicious vehicles could not generate valid signatures. When the input traffic volume came up to 600 vehicles per hour for each entrance lane in the simulated intersection， the proposed scheme saved at least 33.77% of authentication overhead compared to certain schemes of the same kind. The outcome of simulation experiment shows that the proposed scheme is suitable for resource-limited VANET environment.