An integrity verification scheme of completeness and zero-knowledge for multi-Cloud storage

To resist the attacks from the malicious Cloud service providers and the organizer, an integrality verification of completeness and zero-knowledge property (IVCZKP) scheme for multi-Cloud environment is proposed. First, the bilinear pairing maps are adopted as a basis of theoretical support for IVCZKP scheme. Second, the change of file blocks is recorded, and the hash value of each block is generated through the index-hash table in the verification process. Finally, the hash value of each block is updated through this index-hash table to support the dynamic updates to user's data, such as data modification, data insertion, and data deletion. Compared with the original scheme, IVCZKP scheme can resist the forgery attacks and has the completeness and zero-knowledge property. Theory analysis and the experimental results show that this scheme can reduce the computation time and has more performance on integrity verification in multi-Cloud environment.