Delegated Access Control in Public Clouds Using Two Layer Encryption

Abstract

A cloud is a collection of terminals and servers that are publicly accessible via the internet. One of the primary uses of cloud computing Is data storage. In cloud computing, data Is stored in encrypted form to ensure confldentlallty. Here the user performs verification during data storage process. So the data owner requires a Third Party Auditor [TPAJ for auditing. TPA audits the files stored in the cloud. During the audit process, TPA gets the keys from the data owner and views the data for the auditing. The major drawback here is TPA can modify the owner data. So, the proposed system implements the encrypting data and notification method, so that the TPA views the data in encrypted form. For encrypted data auditing, dynamic Provable Data Possession [PDP) is used. But if a TPA tries to decrypt the owner data, then Provable Of Retrievable [PORJ sends the notification to the data owner. Until the owner verifies the notification, the modification will not be committed to the database.