Semantic Bob-tree: a new obfuscation technique for location privacy protection
Proceedings of the 10th International Conference on Advances in Mobile Computing & Multimedia
A novel trajectory privacy-preserving future time index structure in moving object databases
ICCCI'12 Proceedings of the 4th international conference on Computational Collective Intelligence: technologies and applications - Volume Part I
ICT-EurAsia'13 Proceedings of the 2013 international conference on Information and Communication Technology
Semantic-Aware obfuscation for location privacy at database level
ICT-EurAsia'13 Proceedings of the 2013 international conference on Information and Communication Technology
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Preserving user's privacy has recently drawn special attention in the field of location-based services and many techniques such as k-anonymity or obfuscation have been suggested to protect user's privacy. All of these traditional techniques are, however, geometry-based and separated from the database level. This separation causes the query processing to involve in two phases, querying the database to retrieve the exact locations of users and then modifying them to decrease the quality of this information. This two-phase process is time-consuming due to the number of disk accesses required to retrieve the user's exact location. Also, these geometry-based techniques cannot guarantee location privacy when the adversary gains knowledge about the geography of the obfuscated region. We address these problems by proposing Hilbert-based framework for preserving user's privacy and Bob-tree for supporting geographic-aware obfuscation. Experiments and analyses show that this framework provides a significant improvement over the algorithm separated from the database level for both query processing time and location privacy protection.