Hyperledger Fabric blockchain privacy data storage and access system and method thereof

Abstract

The invention discloses a Hyperledger Fabric block chain privacy data storage and access system and its method, including a client module, an SDK module, a smart contract module and a database module. The contract module judges whether the effective chaincode set contains the private data storage chaincode function according to the role information in the client module certificate. If so, the privacy attribute of the encrypted data is stored in the database together with the non-privacy attribute; the client module calls it through the SDK module Private data query chain code function, the smart contract module judges whether the effective chain code set contains private data query chain code function according to the role information in the client module certificate, if so, decrypts the query result of the database module, and returns the real data to the client module, otherwise the ciphertext data is directly returned to the client module. The invention can effectively improve personal privacy security in Hyperledger Fabric data storage, and has the advantages of confidentiality and security.

Description

technical field [0001] The invention relates to the technical field of block chains, in particular to a Hyperledger Fabric block chain privacy data storage and access system and method. Background technique [0002] Blockchain is a distributed ledger technology, and ledger data is open to all nodes in the network. However, while ensuring data sharing, how to ensure personal privacy security in the data sharing environment has become the core issue of blockchain development. When all transaction information of users is exposed to the public, once maliciously mined and utilized by malicious nodes or users, it will pose a serious threat to user privacy. As the most extensive enterprise-level blockchain application platform, the Hyperledger Fabric blockchain shares all transaction data with all nodes connected to the blockchain network and users. In 2018, HyperledgerFabric v1.2 introduced the private data storage method, using the private database privateDB to store private da...

AI Technical Summary

Problems solved by technology

The shortcomings of this method include the following three aspects: (1) Privacy data is still stored in plain text, and data storage lacks confidentiality; (2) Privacy protection is only performed between nodes, and there is a lack of privacy protection between client users. (3) Due to the addition of a private database, it is easy to reduce the performance of the Hyperledger Fabric blockchain itself, and it is difficult to meet the performance requirements in real scenarios

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