Istituto di Scienza e Tecnologie dell'Informazione     
Monreale A., Trasarti R., Renso C., Pedreschi D., Bogorny V. Preserving privacy in semantic-rich trajectories of human mobility. In: SPRINGL 2010 - 3rd ACM SIGSPATIAL International Workshop on Security and Privacy in GIS and LBS (San Jose, CA, USA, 3-5 November 2010). Proceedings, pp. 47 - 54. ACM, 2010.
The increasing abundance of data about the trajectories of personal movement is opening up new opportunities for an- alyzing and mining human mobility, but new risks emerge since it opens new ways of intruding into personal privacy. Representing the personal movements as sequences of places visited by a person during her/his movements - semantic trajectory - poses even greater privacy threats w.r.t. raw geometric location data. In this paper we propose a pri- vacy model defining the attack model of semantic trajectory linking, together with a privacy notion, called c-safety. This method provides an upper bound to the probability of in- ferring that a given person, observed in a sequence of non- sensitive places, has also stopped in any sensitive location. Coherently with the privacy model, we propose an algorithm for transforming any dataset of semantic trajectories into a c-safe one. We report a study on a real-life GPS trajec- tory dataset to show how our algorithm preserves interesting quality/utility measures of the original trajectories, such as sequential pattern mining results.
URL: http://portal.acm.org/citation.cfm?id=1868481&CFID=114368156&CFTOKEN=62549527
DOI: 10.1145/1868470.1868481
Subject Privacy semantic trajectories
H.2.8 Database Applications. Data mining

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