Integrity Verification for Shared Data in Group with User Revocation

Cloud computing provides storage for the multiple users to store and share their data anywhere at anytime basis. There were some security issues faced by the cloud users such as data correctness, data theft, data leakage, privacy on user level because of the third-party data control. One of the major issues in cloud storage is ensuring data integrity when data are shared by multiple users in the cloud and the data owner accesses data locally. To overcome this issue, many public integrity auditing schemes have been proposed where the computation overhead is huge for the data owner. Hence, efficient auditing with minimum overhead at client side is in need. In the proposed method, we have multi-user modification model with user revocation where the auditing work is delegated to a trusted third-party auditor (TPA) on a secure model, thereby reducing the overhead faced by client.