随着车联网的发展，车辆通信将在提高行车安全，驾驶效率和舒适度方面发挥重要作用。车辆将访问多种应用，考虑到现有行车安全应用面临的严峻威胁，加之对用户验证、授权和计费的需求，攻击防护安全对于车载自组网来说尤为重要。在车辆使用基于位置的服务或行车安全服务时，攻击者可能会窃听通信内容，获取用户身份信息和位置隐私。为了提高车载自组织网安全，提出了一种采用分布式车辆公钥基础设施( VPKI)对车辆通信安全、位置隐私和身份匿名进行保护的方案。该方案采用票据为应用服务提供匿名访问控制和认证，并且可以解析和撤销不法车辆身份。最后，通过实验分析方案的效率来证明VPKI的可实施性。%With the development of vehicle networking, vehicle communication plays an important role in improving traffic safety, drive efficiency and ride comfort. Vehicles would usually access lots of applica-tions, since the existing vehicle safety applications are faced with serious threats, and additionally with the demand of user authentication, authorization and accountability, security protection becomes particularly important to VANET ( Vehicular Adhoc Network ) . While receiving the location-based services or safety application, vehicle may expose its identity and location privacy to those adversaries who intercept the com-munication content. In order to improve the security of VANET, a distributed VPKI ( Vehicle Public Key Infrastructure) scheme is proposed to protect vehicular communication security, location privacy and iden-tity anonymity. In this scheme crypto tokens are used as tickets to provide anonymous access control and authentication of application service, and also to resolve and revoke the identity of the illegal vehicles. Fi-nally, the experiment on this scheme indicates the feasibility and effeciency of VPKI.
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