Access control model with enhanced flexibility and scalability for cloud

Cloud computing is an Internet based distributed computing model. It is a utility computing model and achieved coherence by sharing resources on demand. All the Data stored on cloud will be managed and controlled by cloud service provider. Data owner will loose his ownership. Service provider may not be trust worthy, so the data owner will suffers about his data privacy. For solving this issue, earlier various schemes are proposed using attribute-based encryption (ABE). All the proposed schemes suffered from scalability, flexibility issues. In ABE based access control models data will be stored in encrypted form on cloud and data owner will share required keys with the data consumer for accessing the data. ABE schemes suffered from implementing complex access control policies. Key Computation is another area where most of the ABE schemed suffered. We had considered hierarchical attribute-set-based encryption (HASBE) model which was developed by extending cipher text-policy attribute-set-based encryption (CP-ABE) with a hierarchical structure of users. We worked with HASBE scheme to overcome the limitation of scalability and flexibility. In this paper we will discuss the implementation of our scheme.