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Recently, there arose a necessity to distribute computing applications frequently across grids. Ever more these applications depend on services like data transfer or data portal services and submission of jobs. Owing to the fact that the distribution of services and resources in wide-area networks are heterogeneous, dynamic, and multi-domain, security is of vital significance in grid computing. Authorization and access control; the significant aspects of security, have attracted increased attention in grid computing. Role Based Access Control (RBAC) is an emerging access control mechanism in grid computing. RBAC was afforded in the Globus toolkit with the support of Community Authorization Service (CAS) and this CAS was employed by several researchers in providing access control.
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