| Abstract |
The progress of smart cities is closely dependent on data, that are sensed by a number of mobile devices, and provide various intelligence services for the cities. However, with the increasing importance of data, privacy threats are increasing. Malicious actors can exploit eavesdropping and data analysis to illicitly access users' sensitive information, which may encompass location data, preferences, social behavior, and smart home data. To this end, this article proposes a new certificateless blind signature (CLBS) scheme combined with a conditional revocation function to enhance user privacy protection in the smart city environment. Concretely, the scheme relies on an anonymous authentication mechanism to protect user identity privacy and uses an anonymous revocation mechanism to resist malicious data submission. In addition, the proposed scheme addresses the key escrow problem commonly encountered in traditional cryptosystems. The security of the scheme is verified by the random oracle model, and the bilinear pairing operation is avoided in the design to improve efficiency. Performance analysis results show that the proposed scheme improves the computational efficiency by at least 20% compared with the previous schemes. © 2014 IEEE. |
