دانلود رایگان مقاله انگلیسی درمورد محدودیتهای موجود حریم خصوصی منطقه ای - الزویر 2017

Abstract

In the context of a single report of location information, existing researches define location privacy by adversary’s uncertainty, inaccuracy, or incorrectness of the estimation, or by geo-indistinguishability which is a generalization of differential privacy. Each of these existing notions has problems in some specific scenarios. In this paper we illustrate the limitations of existing notions by constructing such scenarios, and introduce a formal definition on location privacy by quantifying the distance between the prior and posterior distribution over the possible locations. Further more, we show how to construct a near-optimal obfuscation mechanism by solving an optimization problem. We compare our proposed mechanism with the Laplace noise based geo-indistinguishable mechanism, and Shokri’s optimal obfuscation mechanism, using both our proposed privacy metric and the traditional metric based on the estimated distance errors. The results show that our proposed metric better describes location privacy and our proposed mechanism makes a better tradeoff between privacy and utility.

8. Conclusion

In this paper, we survey on existing notions of location privacy and make detailed analysis on their limitations. We introduce a new notion of privacy, by quantifying the difference between the prior and posterior knowledge of adversary. With this notion, we show that an optimal obfuscation mechanism  can be constructed by solving a non-linear optimization problem. We propose a near-optimal mechanism, and compare it with the state-of-the-art obfusca435 tion mechanisms, using both our proposed metric and the estimated distance error. The results show that under the same quality constraints, our proposed mechanism can achieve better privacy.