Abstract

Adoption of cloud services that have biggest obstacles is that security challenges when considering it. Current approach is that hosting the confidential data in cloud based on fine-grained encryption of data by fine grained access control. In this approach, before uploading the data, data owners should encrypt the data and whenever the user changes. Data owners incur high communication and computation costs. To achieve security and confidentiality, we make use of approach base don’t layers of encryption, that addresses such requirement. Under this approach, the data owner performs a coarse-grained encryption, where in cloud performs a fine-grained encryption on to the owner encrypted data. We utilize an efficient group key management scheme that supports ACPs. Our system as sure the confidentiality of the data and preserves the privacy of users from the cloud while delegating most of the access control enforcement to the cloud.