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A Secure, Scalable, Flexible and Fine-Grained Access Control Using Hierarchical Attribute-Set-Based Encryption (HASBE) in Cloud Computing

Cloud Computing is going to be very popular technology in IT enterprises. For any enterprise the data stored is very huge and invaluable. Since all tasks are performed through network it has become vital to have the secured use of legitimate data. In cloud computing the most important matter of concern are data security and privacy along with flexibility, scalability and fine grained access control of data being the other requirements to be maintained by cloud systems Access control is one of the prominent research topics and hence various schemes have been proposed and implemented. But most of them do not provide flexibility, scalability and fine grained access control of the data on the cloud. In order to address the issues of flexibility, scalability and fine grained access control of remotely stored data on cloud we have proposed the hierarchical attribute set-based encryption (HASBE) which is the extension of attributeset-based encryption(ASBE) with a hierarchical structure of users. The proposed scheme achieves scalability by handling the authority to appropriate entity in the hierarchical structure, inherits flexibility by allowing easy transfer and access to the data in case of location switch. It provides fine grained access control of data by showing only the requested and authorized details to the user thus improving the performance of the system. In addition, it provides efficient user revocation within expiration time, request to view extra-attributes and privacy in the intra-level hierarchy is achieved. Thus the scheme is implemented to show that is efficient in access control of data as well as security of data stored on cloud with comprehensive experiments.