Integrity checking privacy preserving approach to cloud using third party auditor

Cloud is a platform where user can store the data and enjoy services provided by cloud. User is free from burden of storage and maintenance. Data integrity verification is challenging task as user no longer possesses data locally. User should use the cloud data without worrying its integrity. So, to enable public auditability external party auditor called as third party auditor is used to check integrity of cloud data. Following are the two requirements which should be met 1) Third party auditor should verify cloud data without asking copy of data. 2) Auditing process should not bring any vulnerability towards user's data. Our system supports privacy preserving public auditability.