33 lines
3.4 KiB
TeX
33 lines
3.4 KiB
TeX
\chapter{Abstract}
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\label{ch:abs}
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% \kat{Il faut aussi en francais :) }
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% \mk{D'accord :( }
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Sensors, portable devices, and location-based services, generate massive amounts of geo-tagged, and/or location- and user-related data on a daily basis.
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The manipulation of such data is useful in numerous application domains, e.g.,~healthcare, intelligent buildings, and traffic monitoring.
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A high percentage of these data carry information of user activities and other personal details, and thus their manipulation and sharing arise concerns about the privacy of the individuals involved.
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To enable the secure---from the user privacy perspective---data sharing, researchers have already proposed various seminal techniques for the protection of user privacy.
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However, the continuous fashion in which data are generated nowadays, and the high availability of external sources of information, pose more threats and add extra challenges to the problem.
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% \kat{Mention here the extra challenges posed by the specific problem that you address : the Landmark privacy}
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It is therefore essential to design solutions that not only guarantee privacy protection but also provide configurability and account the preferences of the users.
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% Survey
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In this thesis, we investigate the literature regarding data privacy in continuous data publishing, and report on the proposed solutions, with a special focus on solutions concerning location or geo-referenced data.
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As a matter of fact, a wealth of algorithms has been proposed for privacy-preserving data publishing, either for microdata or statistical data.
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In this context, we seek to offer a guide that would allow readers to choose the proper algorithm(s) for their specific use case accordingly.
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We provide an insight into time-related properties of the algorithms, e.g.,~if they work on infinite, real-time data, or if they take into consideration existing data dependence.
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% Landmarks
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Having discussed the literature around continuous data publishing, we continue to propose a novel type of data privacy, called \emph{{\thething} privacy}.
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We argue that in continuous data publishing, events are not equally significant in terms of privacy, and hence they should affect the privacy-preserving processing differently.
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Differential privacy is a well-established paradigm in privacy-preserving time series publishing.
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Different schemes exist, protecting either a single timestamp, or all the data per user or per window in the time series, considering however all timestamps as equally significant.
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The novel scheme that we propose, {\thething} privacy, is based on differential privacy, but also takes into account significant events (\emph{\thethings}) in the time series and allocates the available privacy budget accordingly.
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We design three privacy schemes that guarantee {\thething} privacy and further extend them in order to provide more robust privacy protection to the {\thething} set.
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We evaluate our proposal on real and synthetic data sets and assess the impact on data utility with emphasis on situations under the presence of temporal correlation.
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% \kat{add selection, and a small comment on the conclusions driven by the experiments.}
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The results of the experimental evaluation and comparative analysis of {\thething} privacy validate its applicability to several use case scenarios with and without the presence of temporal correlation.
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\paragraph{Keywords:}
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information privacy, continuous data publishing, crowdsensing, privacy-preserving data processing
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