Secure outsourced VANET data in clouds with designated supervisor

With the rapid development of information technology, a large number of vehicles and roadside units can be communicated through vehicular ad-hoc network (VANET). The information collected by vehicles can be shared with other entities such as vehicles and traffic management department to improve traffic condition. In order to facilitate the storage of massive data, it is a better way to maintain data at clouds, and allow some supervisors to audit data integrity. This paper introduces a secure cloud storage scheme with designated supervisor (SODS) on bilinear groups, which allows vehicles to upload the collected data to clouds, and only the designated supervisor to verify data integrity before using these data. Security and performance analyses demonstrate that the proposed scheme is secure and efficient.