Homomorphic Authenticable Ring Signature (HARS) mechanism for Public Auditing on Shared Data in the cloud (Oruta)
Sonam M. Kamble · 2014
Abstract — Users in a particular group need to compute signatures on the blocks in shared data,so that the shared data integrity can be confirmed publicly,.Various blocks in shared data are usually signed by various vast number of users due to data alterations performed by different users. Once a user is revoked from the group, an existing user must resign the data blocks of the revoked user in order to ensure the security of data. Due to the massive size of shared data in the cloud, the usual process, which permits an existing user to download the corresponding part of shared data and re-sign it during user revocation, is inefficient.The new public auditing scheme for shared data with efficient user revocation in the cloud is proposed so that the semi-trusted cloud can re-sign the blocks that were previously signed by the revoked user with the valid proxy re-signatures, when a user in the group is revoked.