PhD defence: Privacy in Collaborative Systems

PhD defence of O. Ulusoy


The internet and smartphones have become an integral part of our lives, enabling us to connect with others in ways that were not possible before. Through the use of social networks, people connect with each other, and share content such as images, videos or text messages. While the provided service is beneficial for its users, the sharing of content within social networks can create privacy concerns.

In this dissertation, we tackle privacy issues on online social networks when sharing content. We advocate a collaborative privacy resolution mechanism where each party that might have its privacy affected has a say in the sharing decision.

Our mechanism uses an auction-based approach with which social network users can bid for privacy decisions to reach a collaborative outcome that benefits all. Furthermore, we develop personal privacy assistants, which can learn the privacy requirements of the users they represent and act on behalf of them for privacy decisions.

We enhance the abilities of our approach by developing a norm-based mechanism, which can identify emerging privacy norms in society, and incorporates them in users' decisions. With simulations and experiments in case studies, we show that our collaborative privacy approach can preserve the privacy of online social network users efficiently, while still enabling the users to share content that reaches its intended audience.

Start date and time
End date and time
Academiegebouw, Domplein 29
PhD candidate
O. Ulusoy
Privacy in Collaborative Systems
PhD supervisor(s)
prof. dr. P. Yolum Birbil
dr. T. Baarslag