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Cloud computing has changed the way enterprises store, access and share data.Data is constantly being uploaded to the cloud and shared within anorganization built on a hierarchy of many different individuals that are givencertain data access privileges. With more data storage needs turning over tothe cloud, finding a secure and efficient data access structure has become amajor research issue. With different access privileges, individuals with moreprivileges (at higher levels of the hierarchy) are granted access to moresensitive data than those with fewer privileges (at lower levels of thehierarchy). In this paper, a Privilege-based Multilevel OrganizationalData-sharing scheme~(P-MOD) is proposed that incorporates a privilege-basedaccess structure into an attribute-based encryption mechanism to handle theseconcerns. Each level of the privilege-based access structure is affiliated withan access policy that is uniquely defined by specific attributes. Data is thenencrypted under each access policy at every level to grant access to specificdata users based on their data access privileges. An individual ranked at acertain level can decrypt the ciphertext (at that specific level) if and onlyif that individual owns a correct set of attributes that can satisfy the accesspolicy of that level. The user may also decrypt the ciphertexts at the lowerlevels with respect to the user's level. Security analysis shows that P-MOD issecure against adaptively chosen plaintext attack assuming the DBDH assumptionholds.The comprehensive performance analysis demonstrates that P-MOD is moreefficient in computational complexity and storage space than the existingschemes in secure data sharing within an organization.

P-MOD: Secure Privilege-Based Multilevel Organizational Data-Sharing in Cloud Computing