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A statistical approach to the design of privacy-preserving services

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dc.contributor.advisor Perez Gonzalez, Fernando
dc.contributor.advisor Troncoso, Carmela Oya Diez, Simon 2019-07-23T07:36:59Z 2019-07-23T07:36:59Z 2019-07-23 2019-05-20
dc.description.abstract Electronic services have become an indispensable part of society. Billions of users rely on these services every day to communicate with friends, meet new people, buy products, and keep track of their activities. Electronic services provide many comforts to society, but also pose new threats to the privacy of their users. This is due to the fact that users of electronic services send their sensitive information over a communication channel (typically, the Internet), and this information can many times be observed by an unwanted party. Even though encryption can protect the content of communications against unwanted observers, there are other privacy problems that encryption does not solve. In this thesis, we study two of these problems. First, we tackle the problem of meta-data leakage against a passive eavesdropper. Meta-data is information related to a communication other than the content of the communication itself, such as who the communicating parties are, how often they communicate, or where they are located. Meta-data is usually sensitive, so it is important that users hide it from eavesdroppers. In the first part of this thesis, we study a particular solution to meta-data leakage: mix-based anonymous communication systems. We analyze these systems, and find out how to optimally configure their parameters so as to maximize the users' privacy. In the second part of the thesis, we study how to protect users against an adversarial service provider. We consider the particular case of Location-Based Services (LBS), where users want to obtain some service that depends on their real location (e.g., finding nearby points of interest), but do not want to share this location with the service provider. We study obfuscation-based location privacy mechanisms, that allow users to obtain some utility from the LBS without revealing their actual location. We find weaknesses in the approach that previous works follow to design and evaluate location privacy-preserving mechanisms, and propose solutions to mend these issues and improve current designs. Throughout the thesis we follow a statistical approach to improve the privacy of electronic services: we model both the system operation and the users' behavior, and leverage these models to optimize the privacy of the systems. This approach provides theoretical guarantees that our results will be universally valid as long as the models that we assume for user behavior hold. Also, our methodology can be easily adapted to other privacy problems, and we hope it will inspire future research in this direction en
dc.description.sponsorship TACTICA spa
dc.description.sponsorship WITDOM Project. Grant 644371 spa
dc.description.sponsorship NEXTLEAP Program. Grant 688722 spa
dc.description.sponsorship RedTematica RedTEIC 2017-2018 spa
dc.description.sponsorship Fundación Barrié. Programa de Becas de Posgrado en el Extranjero spa
dc.description.sponsorship COMONSENS. CONSOLIDER-INGENIO 2010 / CSD2008-00010 spa
dc.description.sponsorship COMPASS / TEC2013-47020-C2-1-R spa
dc.description.sponsorship WINTER / TEC2016-76409-C2-2-R spa
dc.language.iso eng spa
dc.rights Attribution-NonCommercial-NoDerivs 3.0 Spain
dc.title A statistical approach to the design of privacy-preserving services spa
dc.title.alternative Tratamiento de señal aplicado a servicios de privacidad spa
dc.title.alternative Tratamento de sinal aplicado a servizos de privacidade spa
dc.type doctoralThesis spa
dc.rights.accessRights openAccess spa
dc.publisher.departamento Teoría do sinal e comunicacións spa
dc.publisher.grupoinvestigacion Grupo de Procesado de Sinal en Comunicacións spa
dc.publisher.programadoc Programa de Doutoramento en Tecnoloxías da Información e as comunicacións pola Universidade de Vigo (RD 99/2011)
dc.subject.unesco 3325 Tecnología de las Telecomunicaciones spa
dc.subject.unesco 1203.18 Sistemas de Información, Diseño Componentes spa
dc.subject.unesco 1203 Ciencia de Los Ordenadores spa 2019-07-05 2019-05-24T08:05:21Z
dc.advisorID 825

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