Block chain data sharing method and device

Abstract

The invention relates to the field of financial technology. The invention further discloses a block chain data sharing method and device. The method comprises the steps that a sharing mechanism obtains a first file, determines a hash value of the first file, determines an exchange public key corresponding to the first file, and the exchange public keys of the plurality of first sharing mechanismsare obtained, an encryption key is determined according to the exchange public key corresponding to the first file and the exchange public keys of the plurality of first sharing mechanisms, the firstfile is encrypted by using the encryption key to obtain an encrypted ciphertext of the first file, and the encrypted ciphertext is sent to the data sharing smart contract of the block chain. Due to the fact that the exchange public key corresponding to the first file is obtained through the private key and the index number of the sharing mechanism, different exchange keys can be generated for different files under the condition that the private key of the sharing mechanism is not changed, and user privacy can be protected flexibly, conveniently, safely and effectively. And the encrypted file is sent to the block chain, so that real chaining of the encrypted file is realized, and real data sharing is realized.

Description

technical field [0001] Embodiments of the present invention relate to the field of financial technology (Fintech), and in particular to a blockchain (BlockChain) data sharing method and device. Background technique [0002] With the development of computer technology, more and more technologies are applied in the financial field. The traditional financial industry is gradually transforming into financial technology (Finteh), and blockchain technology is no exception. However, due to the security and real-time requirements of the financial industry , but also higher requirements for technology. [0003] The existing blockchain system does not directly send encrypted data to the blockchain, but only uploads the Hash (hash) result of the plaintext data to the chain to achieve a certain tamper-proof and verifiable effect; the specific process is as follows : Encrypt the plaintext data using the Hash algorithm (commonly used but not limited to the SHA-2 algorithm), store the has...

AI Technical Summary

Problems solved by technology

[0004] However, the data in the above scheme is not really stored on the blockchain, and it is impossible to share data and control the authority of data sharing on the blockchain, but only store the verification data; it is impossible to restore the ciphertext from the blockchain to plaintext

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