File storage and reading method and file storage and reading system in block chain network

Abstract

The invention provides a file storage and reading method and a file storage and reading system in a block chain network, and the method comprises the steps: splitting a storage hash value through employing a secret sharing method, obtaining a plurality of initial tuple data, encrypting the initial tuple data through employing a node public key, and obtaining the encrypted initial tuple data; and it is ensured that the node can only decrypt the initial tuple data of the node and cannot obtain the initial tuple data of other nodes. According to the scheme, when the client side reads the file, the storage hash value can be restored to read the file only when the client side obtains the authorization of the nodes with the number larger than or equal to the threshold number, control management of the file reading permission is achieved, and data privacy of a user is protected. Furthermore, effective time is set for each encryption tuple data, and the file reading permission of the user is controlled in a finer-grained mode.

Description

technical field [0001] This application relates to blockchain network technology, and in particular to file storage and reading methods and storage and reading systems in the blockchain network. Background technique [0002] As a distributed account technology, blockchain realizes distributed trust and security while sacrificing its processing power. Compared with traditional web centralized servers, its processing performance is very limited. When storing large files, if the large files are directly uploaded to the chain, it will put a lot of pressure on the blockchain network and consume a lot of bandwidth. Therefore, the usual practice is to store files off-chain, and only upload the fingerprint of the file, that is, the hash (hash) value of the file to the chain. [0003] InterPlanetary File System (IPFS) is a distributed file system and a new point-to-point hypermedia text transmission protocol, which provides a natural decentralized large file storage solution, perfec...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the current block chain file storage method based on the IPFS network, the permission problem of file reading is not considered, resulting in the file being read by all participants on the block chain network without distinction, and the user's data privacy and security cannot be obtained. Regarding protection issues, this application discloses a file storage method, a file reading method, and a file storage and reading system in a blockchain network through the following aspects

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