Hanaa Alshareef, Computer Science and Engineering

​A Collaborative Access Control Framework for Online Social Networks

Online social networks (OSNs) are one of the most popular web-based services for people to communicate and share information with each other. With all their benets, OSNs might raise serious problems in what concerns users’ privacy. One privacy risk is caused by accessing and sharing co-owned data items, i.e., when a user posts a data item that involves other users, some users’ privacy may be disclosed, since users generally have dierent privacy preferences regarding who can access and share their data. Another risk is caused by the privacy settings oered by OSNs that do not, in general, allow ne-grained enforcement, especially in cases where posted data items concern other users. 
We discuss and give examples of these issues, in order to illustrate their impacts on current OSNs’ privacy protection mechanisms. We propose a collaborative access control framework to deal with such privacy issues. Basically, in our framework, the decision whether a user can access or share a co-owned data item is based on the aggregated opinion of all users involved. Our solution is based on the sensitivity level of users with respect to the concerned data item, the trust among users, the types of controllers (those who are concerned in making the collaborative decision) and the types of accessors (those who are identied to access a given data item or not). In order to observe how varying some of the parameters mentioned above inuence the outcome of the permitting/denying decision of the proposed solution, we provide an evaluation of our framework. We also present a proof-of-concept implementation of our approach in the open source OSN Diaspora.

​Hanaa Alshareef belongs to the Formal Methods division of Computer Science and Engineering.

Discussion leader
Associate professor Barbara Carminati, University of Insubria, Italy.

Category Licentiate seminar
Location: EA, lecture hall, Hörsalsvägen 11, EDIT trappa C, D och H
Starts: 13 June, 2019, 13:30
Ends: 13 June, 2019, 14:30

Published: Fri 24 May 2019.