Supervisable data anonymous sharing method and system based on block chain

Abstract

The invention discloses a supervisable data anonymous sharing method and a supervisable data anonymous sharing system based on a block chain. The method comprises the steps that when a data using nodeinitiates a data sharing request to a data owning node, the data owning node generates a re-encryption key through a private key of the data owning node and a public key of the data using node, and sends the re-encryption key to a proxy server; the proxy server stores a random key used for encrypting plaintext data in advance by the data owning node and a data ciphertext at the position of the cloud server according to the re-encryption key, encrypts the random key and the data ciphertext according to a public key of the data owning node, then performs re-encryption conversion on the encrypted random key and the encrypted data ciphertext together as a ciphertext, and sends the re-encryption conversion result to the data using node; and the data use node obtains the encryption key of the to-be-shared data and the storage position of the to-be-shared data in the cloud database through decryption of the private key of the data use node, extracts the corresponding position data in the cloud database and obtains the to-be-shared data through decryption according to the encryption key.

Description

technical field [0001] The present invention relates to the field of information technology, and more particularly, to a method and system for anonymous sharing of supervised data based on blockchain. Background technique [0002] Blockchain technology breaks the centralized characteristics of the traditional Internet, so that the trust crisis that plagues the modern economy can be solved to a certain extent. An important feature of the blockchain is data transparency. The data stored on the blockchain is visible to any node on the chain. Although this ensures that any attempts to tamper with data privately will be recorded and discovered, but This also seriously affects the privacy of data. In some usage scenarios, users do not want their data to be viewed by anyone at any time. For example, in business or government affairs, some confidential data of governments and companies needs to be kept strictly confidential. Only in specific scenarios, the right to decrypt the data...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the existing block chain technology existing in the background technology in the field of business or government affairs, the data requires both privacy sharing and hierarchical supervision. The present invention provides a block chain-based anonymous data sharing method that can be supervised And the system, the method and the system use the proxy re-encryption algorithm to convert the ciphertext from the encryption of the public key of the data owner node to the encryption of the public key of the data receiver without disclosing the private key and plaintext of the data owner node so as to realize data privacy sharing ; Use the hierarchical attributes of the tree-shaped key distribution mechanism to solve the hierarchical supervision requirements of data on the chain

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