A Secured Access Control Technique for Cloud Computing Environment Using Attribute Based Hierarchical Structure and Token Granting System

Cloud computing has drastically condensed the computational and storage costs of outsourced data. The existing access control techniques offer users access provisions centered on the common user attributes like Roles, which reduces the fine-grained access measure. The paper defines a Storage Correctness and Fine-grained Access Provision (SCFAP) scheme, that provides the user an exclusive access through the use of a hierarchical structure which is a combination of users unique and common attributes. Also, we deploy the concept of Token Granting system that allows the users to verify the correctness of outsourced data without the retrieval of the respective files. The tokens are derived from the metadata containing file location that helps in the process of storage correctness verification and improvises the storage efficiency. The experimental results show SCFAP has improved storage efficiency and error recovery measures than existing techniques.