城市环境下基于车辆分类的车载自组网隐私保护方案研究

车载自组织网络的出现，在提高交通效率、改善交通环境的同时，也带来例如消息篡改、伪造和身份信息泄露等安全威胁.这就要求设计出更加符合车载网特性的消息认证方案.本文提出一种城市环境下的车载自组织网络隐私保护方案，其中包括对车辆进行分类，以及为不同类别的车辆分配不同的信任值的方法.在私人车辆认证的过程中采取一种假名多次签名方案对消息进行签名，在公用车辆和固定单元不需要身份隐私保护的情况下可以直接选用RSA签名方案对消息签名，在签名的同时都需要使用对信任值进行累加的策略来提高消息的可靠性.最后使用SUMO、MOVE和NS2进行联合仿真实验，结果表明该方案具有较好的灵活性，而且认证时间小于其他方案.

Privacy protection scheme for VANET based on urban vehicle classification

The Vehicular Ad Hoc Network (VANET) enhances the traffic efficiency and improves the traffic environment,however,it brings up security threats such as information tampering,forgery,as well as privacy disclosure.Thus,the message authentication scheme consistent with characteristics of the VANET is in urgent need.In this paper,we take the option of privacy protection scheme for VANET based on vehicle classification in urban transport system,which includes classification and assignment of trust values for different types of vehicles.For private vehicles,a pseudonym multiple signature scheme is employed to sign the message;while for the public vehicles and RSUs without identity privacy protection requirement,we can use the RSA signature scheme to sign messages.At the same time,the signature is required to accumulate the trust value of the strategy to improve the message reliability.Finally,SUMO,MOVE and NS2 are employed to jointly simulate the proposed scheme,and the result shows that the scheme is more flexible and less time-consuming compared with other schemes proposed in references of19-20].