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Cloud Computing is a set of IT Services that are provided to a customer overa network and these services are delivered by third party provider who owns theinfrastructure and reduce the burden at user's end. Nowadays researchersdevoted their work access control method to enhance the security on Cloud. RBACis attractive access model because the number of roles is significantly lesshence users can be easily classified according to their roles. The Role-basedAccess Control (RBAC) model provides efficient way to manage access toinformation while reducing the cost of security administration and complexityin large networked applications. This paper specify various policies in RBAC onclouds such as migration policy which helps the user to migrate the databaseschema and roles easily to the Cloud using XML with more security. Restrictionpolicy provide the security enhancement in Role Based Access Model byrestricting the number of transaction per user and if the number oftransactions will increase the admin will come to know through its monitoringsystem that unauthorized access has been made and it would be easier to takeaction against such happening. This paper proposes backup and restorationpolicy in Role Based Access Model in which if the main cloud is crashed or notworking properly then the backup and restoration facility will be available toavoid the lost of important data. In this case chances of loss of data are veryless so enhance more security on Cloud Computing.

Policy Specification in Role based Access Control on Clouds