Hyperledger Fabric block chain private data storage and access system and method thereof

Abstract

The invention discloses a Hyperledger Fabric block chain private data storage and access system and a method thereof. The system comprises a client module, an SDK module, an intelligent contract module and a database module, the client module calls a private data storage chain code function through the SDK module, the intelligent contract module judges whether an effective chain code set containsthe private data storage chain code function or not according to role information in a certificate of the client module, and if the effective chain code set contains the private data storage chain code function, the private attribute of the encrypted data and the non-private attribute are stored in a database together; the client module calls the private data query chain code function through theSDK module; and the intelligent contract module judges whether the effective chain code set contains a private data query chain code function or not according to role information in a certificate of the client module, if so, decrypts a query result of the database module and returns real data to the client module, and otherwise, directly returns ciphertext data to the client module. According to the method and the system, the personal privacy security in Hyperledger Fabric data storage can be effectively improved, and the method and the system have 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 priv

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