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Formalising Privacy Policies for Social Networks

Raul Pardo Jimenez (Institutionen för data- och informationsteknik, Programvaruteknik (Chalmers))
Göteborg : Chalmers University of Technology, 2015. - 102 s.
[Licentiatavhandling]

Social Network Services (SNSs) have changed the way people communicate, bringing many benefits but also the possibility of new threats. Privacy is one of them. We present here a framework to write privacy policies for SNSs and to reason about such policies in the presence of events making the network to evolve. The framework includes a model of SNSs, a logic to specify properties and reasoning about the knowledge of the users (agents) of the SNS, and a formal language to write privacy policies. Agents are enhanced with a reasoning engine allowing to infer knowledge from previously acquired one. To describe the way SNSs may evolve, we provide operational semantics rules which are classified into four categories: epistemic, topological, policy, and hybrid, depending on whether the events under consideration change the knowledge of the SNS' users, the structure of the social graph, the privacy policies, or a combination of the above, respectively. We provide specific rules for describing Twitter's behaviour, and prove that it is privacy-preserving (i.e., that privacy is preserved under any possible event of the system). We also show how Twitter and Facebook are not privacy-preserving in the presence of additional natural privacy policies.

Nyckelord: Privacy, Social Networks, Epistemic Logic, Knowledge base



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Denna post skapades 2015-09-15. Senast ändrad 2016-03-19.
CPL Pubid: 222460

 

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Institutioner (Chalmers)

Institutionen för data- och informationsteknik, Programvaruteknik (Chalmers)

Ämnesområden

Informations- och kommunikationsteknik
Teoretisk datalogi
Datalogi

Chalmers infrastruktur

Examination

Datum: 2015-10-12
Tid: 10:00
Lokal: room EF, EDIT building, Rännvägen 6B, Chalmers University of Technology
Opponent: Deepak Garg, Max Planck Institute for Software Systems,Germany.