Quantifying privacy leakage through answering database queries

Abstract. We assume a database consists of records of individuals with private or sensitive fields. Queries on the distribution of a sensitive field within a selected population in the database can be submitted to the data center. The answers to the queries leak private information of individuals though no identification information is provided. Inspired by decision theory, we present a quantitative model for the privacy protection problem in such a database query or linkage environment in this paper. In the model, the value of information is estimated from the viewpoint of the querier. To estimate the value, we define the information state of the data user by a class of probability distributions on the set of possible confidential values. We further define the usefulness of information based on how easy the data user can locate individuals that fit the description given in the queries. These states and the usefulness of information can be modified and refined by the user’s knowledge acquisition actions. The value of information is then defined as the expected gain of the privacy receiver and the privacy is protected by imposing costs on the answers of the queries for balancing the gain

Social privacy: perceptions of veillance, relationships, and space with online social networking services

A thesis submitted to the University of Bedfordshire, in fulfilment of the requirements for the Degree of Doctor of Philosophy (PhD)This research seeks to examine the experience of social privacy around online social networking services. In particular, it examines how individuals experience social privacy through the perception of veillance, relationships and space. It highlights that individuals need varying types of veillance and relationships in order to experience the social privacy they desire. It also highlights that individuals used the perception of space to indicate acceptable convention within that space; seeking spaces, both real and metaphorical, that they perceived to afford them the experience of social privacy. Through the application of phenomenological methods drawn from ethnography this study explores how the experience of social privacy is perceived. It does this through examining the perception of veillance, relationships and space in separation, though notes that the individual perceives all three simultaneously. It argues that the varying conditions of these perceptions afford the individuals the experience of social privacy. Social privacy is, therefore, perceived as a socially afforded emotional experience