2026-04-13T06:48:27Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4041982026-01-28T01:45:17Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Parra Arnau, Javier author 2018-01 Very recently, we are witnessing the emergence of a number of start-ups that enables individuals to sell their private data directly to brokers and businesses. While this new paradigm may shift the balance of power between individuals and companies that harvest and mine data, it raises some practical, fundamental questions for users of these services: how they should decide which data must be vended and which data protected, and what a good deal is. In this work, we investigate a mechanism that aims at helping users address these questions. The investigated mechanism relies on a hard-privacy model and allows users to share partial or complete profile data with broker and data-mining companies in exchange for an economic reward. The theoretical analysis of the trade-off between privacy and money posed by such mechanism is the object of this work. We adopt a generic measure of privacy although part of our analysis focuses on some important examples of Bregman divergences. We find a parametric solution to the problem of optimal exchange of privacy for money, and obtain a closed-form expression and characterize the trade-off between profile-disclosure risk and economic reward for several interesting cases. Finally, we evaluate experimentally how our approach could contribute to privacy protection in a real-world data-brokerage scenario. This work was partly funded by the European Commission through the H2020 project “CLARUS”, as well as by the Spanish Ministry of Economy and Competitiveness (MINECO) through the project “Sec-MCloud”, ref. TIN2016- 80250-R. J. Parra-Arnau is the recipient of a Juan de la Cierva postdoctoral fellowship, FJCI-2014-19703, from the MINECO Postprint (author's final draft) Àrees temàtiques de la UPC::Informàtica Data protection. User privacy Disclosure risk Data brokers Disclosure-money trade-off Protecció de dades Optimized, direct sale of privacy in personal data marketplaces