Cloud stores the major data around the universe and is one of the most developing technologies today. To protect the data stored on such cloud is one major challenge faced now days. To overcome these data security challenges, an efficient data encryption to encrypt sensitive data before sending to the cloud server has been proposed. This addresses the block level data encryption using symmetric key with rotation. Besides, data users can re-construct the requested data from cloud server using shared secret key. The analysis of the privacy protection of outsourced data using experiment is carried out on the repository for all kinds of files with variable size. The security and performance analysis shows that the proposed method is highly efficient than existing methods performance.
