Access Control Mechanism Based on Key Assignment and User Trust Level for Social Network Services

Recently, as Internet enters WEB 2.0, many social network services through such as Facebook, Twitter and Youtube appeared. In these social network sites, users can easily make friends, join groups and access others personal information. Therefore, a malicious user can easily gather information of others. In order to protect user`s personal information from the unauthenticated users, we propose privacy protection mechanism based on key assignment and user`s trust level. A master-key is generated for each users and is segmented into a core-key and several sub-key. The master-key stores at the information owner`s side and the sub-key will be distributed to requestor according to the relation and trust level. At last, in order to proof the efficiency, the performance of our proposed mechanism is compared with those of existing mechanisms.