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Research Article Open Access
Cloud computing, as an emerging computing standard. Cloud computing enables users to remotely store their data in a cloud and also benefit from services on-demand. With rapid development of cloud computing, more enterprises will outsource their sensitive data for sharing in a cloud. To maintain the shared data confidential against untrusted cloud service providers (CSPs), a natural way is to store only the encrypted data in a cloud. The major problems of this approach include establishing Decomposing Access Control Polices, delegated access control for the encrypted data, proof of ownership allow storage server to check a user data ownership based on hash value and the access rights from users when they are no longer authorized to access the encrypted data. In the proposed approach the privacy of users is protected while enforcing attribute based ACPs and utilizing the two layer of encryption reduce the overhead at Owner, opposed to unauthorized access to data and to any data leak during sharing process, providing levels of access control verification.