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As the use of peer-To-Peer (P2P) services for distributed file sharing has grown, the need for Fine-Grained Access Control (FGAC) has emerged. Existing access control framework use an all or nothing approach that is inadequate for sensitive content that may be shared by multiple users. In this paper, the authors propose a FGAC mechanism based on selective encryption techniques. Using this approach, the owner of a file specifies access control policies over various byte ranges in the file. The separate byte ranges are then encrypted and signed with different keys. Users of the file only receive the encryption keys for the ranges they are authorized to read and signing keys for the ranges they are authorized to write.
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