车载自组网中基于无证书的密钥隔离批量消息认证方案

针对车载自组网(VANET)中匿名认证存在的安全性问题，提出了一种高效的车载自组网的匿名认证方案。该方案将无证书密码体制和密钥隔离技术结合应用在车载自组网的环境中，通过更新协助器RSU与车辆用户OBUi的密钥，使得某时间段的临时私钥的泄漏不会影响到前向和后向的安全性,并在随机预言模型下证明了该方案的安全性。最后，性能分析结果表明，该方案不仅提高了消息签名匿名认证的效率，而且降低了整个系统运算的开销，具有较好的理论意义与实用价值。

A batch message authentication scheme based on certificateless key insulation in vehicular ad hoc networks

In order to solve the security problem of anonymous authentication in vehicle ad hoc networks (VANET), we propose an efficient anonymous authentication scheme. The scheme combines certificateless password system and key insulation technique in vehicle ad hoc networks by updating the key of the road side unit (RSU) and the vehicle user . The leakage of temporary private key in a certain period of time will not affect the forward and backward security, and the security of the scheme is proved under the random prediction model. Finally, the performance analysis results show that the scheme can not only improve the efficiency of anonymous authentication of message signature, but also reduce the operation cost of the whole system, which has good theoretical significance and practical value.