Abstract: In this project, we propose the HABE (Hierarchy Attribute-Based Encryption) scheme for shared data with large groups in the cloud. We make use of hash signatures to compute verification information on shared data so that the authority is able to audit the correctness of shared data, but cannot reveal the identity of the signer on each block. Hash signature and Keys are generated by Hierarchical Access Tree. We can implement auditing scheme to perform efficient public security to protect both identity and data privacy in cloud environments. Users can also access the data from the data owner through cloud provider in real-time dynamic cloud environment. Data reliability through replication of the original data. Manipulation of data in the replicas, there by maintaining the originality of the data. If hierarcical data are stored in different servers then the unauthorised users cannot access the data.
Keywords: HABE, Data replication, Cloud computing, ABE.