A Confidentiality Scheme for Storing Encrypted Data through Cloud

The advantages of Cloud computing constitute the substantial motivation for user to store and access their data. The cloud storage capacity reduces the data owner's overhead. In spite of several techniques were proposed for storing data on cloud, the data owner still suffers from a lack of confidentiality and time delay in storing their data on cloud. In this paper, a new scheme is proposed for storing data which achieved data confidentiality and time efficiency. A Middleware Management Control (MWM) is built which is an-intermediary layer between customer and cloud providers. Several text documents sizes are prepared for downloading and uploading process to measure time performance. MWM rotates each document rows to columns; then, it divides document into sub-files vertically. Finally, it encrypts each sub-file and stores it into different cloud storage. The divided sub files are mapping with cloud providers through location table. The proposed scheme is evaluated to measure confidentiality and time performance for the upload and downloads process. In spite of the proposed scheme uses extra operations (rotation, dividing and encryption) to enhance confidentiality, the experimental results show that significantly the same time performance has been achieved for uploading and downloading process compared with other works.