| The distributed storage architecture,with its advantages of mass storage and easy expansion,has become the main method for users' heterogeneous storage of big data.However,the confidentiality,integrity and availability of data face severe challenges.As a new type of distributed shared ledger,once the blockchain technology is proposed,it has become an important technology to ensure the security of data by characteristics of decentralization,tamper-resistance and anonymity.This paper researches on the security protocol and prototype system design of distributed data storage based on blockchain.The innovative work are as follows:1.Proposing a blockchain-based provable data integrity protocol.The Merkle attribute in the blockchain is used to check the data integrity.Meanwhile,taking advantage of the open and auditable characteristics of blockchain,users are allowed to implement the publicly verifiable function of the integrity check through the data information on the blockchain.2.Proposing a blockchain-based data assured deletion protocol.The protocol uses the blockchain to store the data deletion proof generated by the server and the root value of the Merkle tree constructed by the proof.Users verify the deletion results received through the proof information on the blockchain to ensure that the servers act honestly and the data is unrecoverable.3.Designing a blockchain-based distributed storage prototype system.Using the key information of the data on the blockchain,the data is stored on a peer-to-peer storage network in an "off-chain storage" manner,and the system supports the designed provable data integrity protocol and data assured deletion protocol.In conclusion,this paper studies the provable data integrity protocol and data assured deletion protocol based on blockchain technology,and deploys them on the designed distributed storage prototype system.The solution has not only a certain theoretical significance,but also some application value. |
PDF Full Text Request