| Summary: | 碩士 === 國立中興大學 === 資訊科學與工程學系 === 103 === Since the rise of cloud computing, there are more and more people dedicate to the study of security in cloud storage in order to ensure the integrity of the stored data. But most of these researches are for single data owner, few of them consider the cases of shared data. Wang et al. are the first to propose public verification on the integrity of multi-owner data in the cloud. We analysis Wang et al.’s scheme and show that it can not resist malicious cloud server from tampering or deleting user’s data. Also, verifiable tags and file are at the same size. So, cloud server needs to spend twice of the space to store the verifiable tags and file. In this thesis, we propose a low storage overhead public verification scheme on the integrity of multi-owner data. And we solve the security problem and reduce the size of verifiable tags. Based on the “user-pays” principle in cloud storage, our scheme can reduce user’s cost, too.
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