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Designing Location Privacy Mechanisms for flexibility over time and space

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 Marco Stronati
Le mardi 01 décembre 2015 à 11:00
Salle de Conférence (Pavillon des Jardins)
Marco Stronati (LIX, Ecole Polytechnique)

With the increasing popularity of GPS-enabled handheld devices, location based services (LBS) have access to accurate location information, raising serious privacy concerns for end users. Trying to address these issues, the notion of geo-indistinguishability was recently introduced, protecting privacy by reporting to the LBS only a noisy version of the user's location.

Standard geo-indistinguishability works well in the case of a sporadic use, however, under repeated use over time, constantly applying noise leads to a quick loss of privacy.

In the first part of this thesis we show that correlation in the trace can be in fact exploited through a prediction function that tries to guess the new location reducing the number of sanitized positions.

Another drawback of geo-indistinguishability is that it treats space in a uniform way, imposing the addition of the same amount of noise everywhere on the map. In the second part of this thesis we propose a novel elastic mechanism that adapts the level of noise to the different degrees of density of each area.

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