Abstract

Abstract — As per the cloud data services, it is commonplace for data to be not only stored in the cloud, but also shared across multiple users. Unfortunately, the integrity of cloud data is subject to doubt about the truth of something due to the presence of hardware/software failures and human errors. Several mechanisms have been designed to allow both data owners and public verifiers to efficiently check the cloud data integrity without retrieving the entire data from the cloud server. In this paper, we propose a novel private-preserving mechanism that supports publically checking on shared data stored in the cloud. With our mechanism, the identity of the signer on each block in shared data is kept private from public verifiers, who are able to efficiently check the shared data integrity without retrieving the entire file. Our experimental results show the effectiveness and efficiency of our mechanism when checking shared data integrity. Index Terms—Public checking, private-preserving, shared data, cloud computing, Ring signature. 1