Protection of shared data among multiple users for online social networks

Online social networks are now a popular way for users to connect, express themselves, and share content. Users in today´s online social networks often post a profile, consisting of attributes like geographic location, interests, and schools attended. Such profile information is used on the sites as a basis for grouping users, for sharing content, and for suggesting users who may benefit from interaction. Online social networks have increased become a de facto portal for billions of regular users like Face book Twitter Linked In world wide. These OSNs offer attractive means for Relations and sharing of information, but it also causes number of problems which are private to users. Suppose online social network allow users to restrict access to share data, at present there is no effective mechanism to provide privacy concerns over confidential data associated with many number of users. To share the profile, relation and content our analysis presents an approach to protect the shared data associated with multiple users in social networks. To capture the essence of multiparty authorization users requirement, along with a multiparty policy specification scheme & enforcement mechanism. Our access control model allows us to Extend the features of traditional mechanisms to perform various tasks such as analysis and design on new model, Comparative study provide usability study and problems in previous and advantages of our method.