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Mobile Information Systems
Volume 2017, Article ID 2189646, 11 pages
Research Article

A Hybrid Location Privacy Solution for Mobile LBS

Department of Computer Engineering, National Institute of Technology, Surat, Gujarat 395007, India

Correspondence should be addressed to Ruchika Gupta; moc.liamg@900tpugr

Received 9 December 2016; Revised 2 March 2017; Accepted 8 March 2017; Published 18 June 2017

Academic Editor: Jaegeol Yim

Copyright © 2017 Ruchika Gupta and Udai Pratap Rao. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The prevalent usage of location based services, where getting any service is solely based on the user’s current location, has raised an extreme concern over location privacy of the user. Generalized approaches dealing with location privacy, referred to as cloaking and obfuscation, are mainly based on a trusted third party, in which all the data remain available at a central server and thus complete knowledge of the query exists at the central node. This is the major limitation of such approaches; on the other hand, in trusted third-party-free framework clients collaborate with each other and freely communicate with the service provider without any third-party involvement. Measuring and evaluating trust among peers is a crucial aspect in trusted third-party-free framework. This paper exploits the merits and mitigating the shortcomings of both of these approaches. We propose a hybrid solution, HYB, to achieve location privacy for the mobile users who use location services frequently. The proposed HYB scheme is based on the collaborative preprocessing of location data and utilizes the benefits of homomorphic encryption technique. Location privacy is achieved at two levels, namely, at the proximity level and at distant level. The proposed HYB solution preserves the user’s location privacy effectively under specific, pull-based, sporadic query scenario.