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Cloud computing is clearly one of today's most dominant paradigms in the Information Technology (IT) industry due to its scalable, flexible, and cost-efficient access to infrastructure and application services. Despite these promising facilities and benefits, cloud users have serious concerns about the data security and privacy. Among all security challenges, access control is of vital importance, since it provides security mechanisms to protect customer's data, cloud services, applications,doi:10.29268/stcc.2016.4.3.3 fatcat:n5fum7zxpza5jck5zvsqqrohl4