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The increasing availability of personal location data pushed by the widespread use of location-sensing technologies raises concerns with respect to the safeguard of location privacy. To address such concerns location privacy-preserving techniques are being investigated. An important area of application for such techniques is represented by Location Based Services (LBS). Many privacy-preserving techniques designed for LBS are based on the idea of forwarding to the LBS provider obfuscated locations, namely position information at low spatial resolution, in place of actual users' positions. Obfuscation techniques are generally based on the use of geometric methods. In this paper, we argue that such methods can lead to the disclosure of sensitive location information and thus to privacy leaks. We thus propose a novel method which takes into account the semantic context in which users are located. The original contribution of the paper is the introduction of a comprehensive framework consisting of a semantic-aware obfuscation model, a novel algorithm for the generation of obfuscated spaces for which we report results from an experimental evaluation and a reference architecture.

목차

1. INTRODUCTION
2. RELATED WORK
3. SEMANTICS-AWARE OBFUSCATION
4. THE OBFUSCATION MODEL
5. COMPUTATION OF THE OBFUSCATED SPACE
6. THE SensFlow ALGORITHM
7. EXPERIMENTAL EVALUATION
8. OPEN ISSUES AND CONCLUDING REMARKS
References

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