Document Type : Research Article
1 Department of Electrical Engineering, K. N. Toosi University of Technology
2 Department of Electrical Engineering, Sharif University of Technology
3 School of Computer Science, Institute for Research in Fundamental Sciences (IPM),Iran- Tehran
Since their introduction, cognitive radio networks, as a new solution to the problem of spectrum scarcity, have received great attention from the research society. An important field in database driven cognitive radio network studies is pivoted on their security issues. A critical issue in this context is user's location privacy, which is potentially under serious threat. The query process by secondary users from the database is one of the points where the problem rises. In this paper, we propose a Privacy Preserving Query Process (PPQP), accordingly. PPQP is a cryptography-based protocol, which takes advantage of properties of some well-known cryptosystems. This method lets secondary users deal in the process of spectrum query without sacrificing their location information. Analytical assessment of PPQP's privacy preservation capability shows that it preserves location privacy for secondary users against different adversaries, with very high probability. Relatively low communicational cost is a significant property of our novel protocol.
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