Cloud computing has changed the way enterprises store, access and share data.
Big data sets are constantly being uploaded to the cloud and shared within a
hierarchy of many different individuals with different access privileges. With
more data storage needs turning over to the cloud, finding a secure and
efficient data access structure has become a major research issue. In this
paper, a Privilege-based Multilevel Organizational Data-sharing scheme (P-MOD)
is proposed that incorporates a privilege- based access structure into an
attribute based encryption mechanism to handle the management and sharing of
big data sets. Our proposed privilege-based access structure helps reduce the
complexity of defining hierarchies as the number of users grows, which makes
managing healthcare records using mobile healthcare devices feasible. It can
also facilitate organizations in applying big data analytics to understand
populations in a holistic way. Security analysis shows that P-MOD is secure
against adaptively chosen plain-text attack assuming the DBDH assumption
holds. The comprehensive performance and simulation analyses using the real
U.S. Census Income data set demonstrate that P- MOD is more efficient in
computational complexity and storage space than the existing schemes.
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