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In recent years, Online Social Networks (OSNs) have become immensely popularas social interaction services among worldwide Internet users. OSNs facilitateThird-party applications (TPAs) which provide many additional functionalitiesto users. While providing the extended services TPAs access the users datawhich would raise serious concerns to user privacy. This is due to the lack ofuser data protection mechanisms by OSN and none of the present OSN platformsoffers satisfactory protection mechanisms to users private data. In this paper,we propose an access control framework called InfoRest to restrict user data toTPA in OSN, considering users privacy preferences and attribute generalization.Further, we propose a relation based access control (ReBAC) policy model anduse predicate calculus to represent access conditions. The usability andcorrectness of the proposed policy model are demonstrated with the help of alogical model developed using answer set programming.

InfoRest: Restricting Privacy Leakage to Online Social Network App