A review of hilevel authorized deduplication method for cloud storage system

The data storage management is the biggest problem in the cloud computing environment. To reduce the storing space and save the bandwidth share the data with others in cloud storage using public-key cryptosystems that produce constant-size cipher texts such that the active delegation of decoding rights for any set of cipher texts but it lead to many privacy problems. To avoid this problem the private and public cloud combine and form a hybrid cloud. In this the confidential data can be stored in private cloud and other data are stored in public cloud. Even though, the exponential growth of ever-increasing volume of data in the cloud has raised many storage challenges. To overcome these challenges we proposed a deduplication technique. It is specialized and resent data compression technique which eliminates redundant data as well as improves the cloud storage and bandwidth utilization. We also present several new deduplication constructions which are supporting authorized duplicate check in hybrid cloud architecture. To protect the confidentiality of sensitive data, whereas supporting deduplication, the convergent encryption technique has been proposed to encrypt the data before outsourcing. To provide the highest data security, this paper makes the first attempt to formally address the problem of authorized data deduplication. We also proposed many new deduplication constructions supporting authorized duplicate check in hybrid cloud architecture, which incurs nominal overhead compared to conventional operation.