Privacy Preserving Zone Based Service Provisioning in Intelligent Transportation Systems using CL-PKC

Abstract

In this research work, we propose conditional privacy-preserving authentication based on certificate-less public key cryptography (CL-PKC) scheme to provide co-operation
between vehicle cloud and internet cloud. The proposed scheme introduces the hierarchical and secure authentication framework of the entire city area into a distinct number of
geographical zones. In addition to authentication, our scheme fulfills all other necessary security requirements. We utilize the method of pre-loading anonymous keys into vehicles tamper-proof device to protect the identity of the driver. When anonymous keys are to be expired, the pool will be replenished after proper authentication. Unlike the vehicle-to-RSU communication, the messages in RSU-to-vehicle communication do not need to provide a privacy requirement, so we employ the RSU to establish a single key pair to sign the messages. The vehicle generates its own public key and advertises the public key on every message it sends, without any digital certificate signed by the trusted authority. Therefore, we prevent outsider’s attacks easily by achieving an implicit authentication of every public key generated by the vehicle. In addition, we ensured the limited validity period for a public key, which makes renewal process easier by eliminating the need for complex certificate management by the central authority. Besides, eliminating the communication cost required for certificate management saves the great amount of bandwidth consumption and reduces control message overhead to a greater extent in our scheme. Further, we have shown that our scheme is secure against identity revealing attack and impersonation attack launched by the malicious vehicle and malicious RSU. In comparison with other existing approaches, the preliminary results from the adopted experiments show that our proposed scheme is efficient in terms of signature verification delay at vehicle side