To solve the problems of existing provable data possession(PDP)protocols only applica-ble to single cloud storage servers and over-reliance on public key infrastructure,a new identity-based multi-cloud multi-replica PDP protocol is proposed.This protocol adopts identity encryption to simplify certificate management,and designs a double-layer Merkle hash tree as a new secure data structure to maintain the freshness and consistency of multi-replica.Security analysis and experimental results verify the security and efficiency of this protocol,which can achieve multi-replica integrity auditing on multiple cloud storage servers,and significantly outperform the efficiency of comparison algorithms in the three stages of tag generation,evidence generation,and evidence verification.
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