P2P SN is emerging as a promising technique for allowing to members to exchange messages or files to a members of group However, the growing number of users who use DSN for sending and receiving messages or sharing their files is increasingly challenging users' privacy and security. In this paper, we propose a flexible privacy-preserving file sharing scheme over DSN that ensures both semantic security and effective availability of receivers. We call the proposed scheme as Partitioned scheme. In this paper, we suggest the partitioned scheme using Dynamic Identity-Based Broadcast Encryption for encryption in P2P SN. The system does not have the central server, each user has a key and roll to decrypt a special part of your file. This paper focuses on providing a dependable and secure DSN file sharing service that allows users' group dynamic access to that shared files.
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