Secure and privacy-preserving task announcement in vehicular cloud

In this paper, we propose a novel secure and privacy-preserving scheme for enhancing security in vehicular cloud based tasks announcement. The proposed scheme uses an efficient multiple receiver signcryption technique with proxy re-encryption in order to prevent the private information of the vehicles from being disclosed during task announcement. By integrating the proxy re-encryption algorithm with multiple receiver signcryption, we eliminate the issue of increasing the computation delay that most of multiple receiver signcryption schemes are suffering from, when the number of receivers increase. The proposed scheme shows a high efficiency in terms of computational cost and ciphertext size. Additionally, the security analysis done confirms that the proposed scheme is more resilient against various security threats to the tasks announcement in vehicular cloud.