Protecting Respondents' Identities in Microdata Release
IEEE Transactions on Knowledge and Data Engineering
k-anonymity: a model for protecting privacy
International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems
FOCS '95 Proceedings of the 36th Annual Symposium on Foundations of Computer Science
Replication is not needed: single database, computationally-private information retrieval
FOCS '97 Proceedings of the 38th Annual Symposium on Foundations of Computer Science
Location Privacy in Mobile Systems: A Personalized Anonymization Model
ICDCS '05 Proceedings of the 25th IEEE International Conference on Distributed Computing Systems
\ell -Diversity: Privacy Beyond \kappa -Anonymity
ICDE '06 Proceedings of the 22nd International Conference on Data Engineering
The new Casper: query processing for location services without compromising privacy
VLDB '06 Proceedings of the 32nd international conference on Very large data bases
Anonymous Usage of Location-Based Services Through Spatial and Temporal Cloaking
Proceedings of the 1st international conference on Mobile systems, applications and services
Alternative Algorithm for Hilbert's Space-Filling Curve
IEEE Transactions on Computers
Preventing Location-Based Identity Inference in Anonymous Spatial Queries
IEEE Transactions on Knowledge and Data Engineering
Computational Geometry: Algorithms and Applications
Computational Geometry: Algorithms and Applications
Private queries in location based services: anonymizers are not necessary
Proceedings of the 2008 ACM SIGMOD international conference on Management of data
ICDE '08 Proceedings of the 2008 IEEE 24th International Conference on Data Engineering
Blind evaluation of nearest neighbor queries using space transformation to preserve location privacy
SSTD'07 Proceedings of the 10th international conference on Advances in spatial and temporal databases
Enabling private continuous queries for revealed user locations
SSTD'07 Proceedings of the 10th international conference on Advances in spatial and temporal databases
Achieving efficient query privacy for location based services
PETS'10 Proceedings of the 10th international conference on Privacy enhancing technologies
A spatial cloaking framework based on range search for nearest neighbor search
DPM'09/SETOP'09 Proceedings of the 4th international workshop, and Second international conference on Data Privacy Management and Autonomous Spontaneous Security
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Mobile devices with global positioning capabilities (e.g., GPS) allow users to ask queries relative to their present location. Since certain queries may be privacy-sensitive, it is important to protect the identity of the users who send requests for Location-based Services (LBS). Instead of reporting the exact user location to the LBS provider, existing privacy-preserving techniques either perturb or encrypt the location data. Current LBS privacy solutions fall into several categories, based on the type of location transformation they employ, and the system architecture they rely on. This position paper introduces a taxonomy of LBS privacy solutions, and discusses the privacy-efficiency trade-offs achieved by various techniques. It also identifies several open problems, and proposes some interesting directions for future research.