Abstract
Current applications, from complex sensor systems (e.g. quantified self) to online e-markets acquire vast quantities of personal information which usually end-up on central servers. This information represents an unprecedented potential for user customized applications and business (e.g., car insurance billing, carbon tax, traffic decongestion, resource optimization in smart grids, healthcare surveillance, participatory sensing). However, the PRISM affair has shown that public opinion is starting to wonder whether these new services are not bringing us closer to science fiction dystopias. It has become clear that centralizing and processing all one's data on a single server is a major problem with regards to privacy concerns. Conversely, decentralized architectures, devised to help individuals keep full control of their data, complexify global treatments and queries, often impeding the development of innovative services and applications.
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