Secure Authorized Deduplication of data in Hybrid Cloud

Data deduplication is an effective compression technique to eliminate duplicate copies of data and has been widely used in cloud storage to reduce the amount of storage space and save bandwidth. For the protection of sensitive data while supporting deduplication, the convergent encryption technique is used to encrypt the data before outsourcing to the cloud. To make system more secure, the different users are again considered while checking deduplication, but problem occurs in this approach if few contents of the two files are different then it will store them as two different files on the cloud due to this cloud storage space reduces. The solution on this problem is to use block level deduplication in this approach file which want to store on cloud is divided into the number of blocks and deduplication is performed on these blocks.