EFFICIENT APPROACH FOR DATA RETRIEVABILITY ONCLOUD STORAGE

Cloud storage is a model of data storage in which the digital data is stored in logical pools. It allows users to store their data in a remote server to get rid of expensive local storage, management costs and to access data of interest anytime anywhere. We propose a dynamic proof of retrievability scheme for supporting efficient recovery from data corruptions. We split up the data into small data blocks and encode that data block using network coding. To eliminate the communication overhead for small data corruptions within a server, each data block is further encoded. Based on the encoded data blocks, we utilize tree structure to enforce the data sequence for dynamic operations, preventing the cloud service provider from manipulating data block. We also analyze with our encrypted Base64 method for the effectiveness of the proposed construction in defending against pollution attacks during data retrievability