Abstract
Local differential privacy (LDP), which has been applied in Google Chrome and Apple iOS, provides strong privacy assurance to users when collecting data from users. We focus on the sensitive spatial data collection, with the goal of obtaining high result utility while satisfying LDP. The existing methods for this problem mostly target at the task of range queries. They combine the frequency estimation technology and spatial decomposition method to publish the number of users located in some sub-spaces. However, these methods cannot well support distance-related applications such as k-means clustering, since they treat the sub-spaces not containing the user equally and do not consider the distances between the sub-space and user data. Motivated by this, we propose dimension-correlated piecewise mechanism (DCPM), a novel LDP perturbation mechanism with a well-designed probability density, in which the distance between the published value and the true one is considered. Extensive experiments on real-world data and synthetic data demonstrate that DCPM achieves significantly higher result utility compared to previous solutions.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (61902365 and 61902366), Open Project Program from Key Lab of Cryptologic Technology and Information Security, Ministry of Education, Shandong University, and the Fundamental Research Funds for the Central Universities (202042008).
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Zhuang, J., Wang, N., Wang, Z., Wang, X., Qu, H., Wei, Z. (2022). Spatial Data Publication Under Local Differential Privacy. In: Zhao, X., Yang, S., Wang, X., Li, J. (eds) Web Information Systems and Applications. WISA 2022. Lecture Notes in Computer Science, vol 13579. Springer, Cham. https://doi.org/10.1007/978-3-031-20309-1_55
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