Fine-grained access control method and system based on double block chains

Abstract

The invention discloses a fine-grained access control method and system based on double block chains, and the method comprises the steps: building an alliance chain, enabling a plurality of attribute authorization mechanisms to serve as a plurality of accounting nodes on the alliance chain, and carrying out the system initialization; enabling each attribute authorization mechanism to generate a respective public and private key pair and publish a respective public key to the alliance chain; enabling the data owner to symmetrically encrypt the shared data; enabling the data owner to encrypt the symmetric key and publishes a key ciphertext and metadata related to the shared data to an Ethernet, and taking the Ethernet as a data sharing charging platform; enabling a data accessor to acquire metadata published by the data owner in the Ethernet, pays by using the Ethernet, and sending a data access request to an attribute authorization mechanism corresponding to the attribute set of the to-be-shared data; enabling the data accessor to decrypt the key ciphertext by using the obtained decryption key, and decrypting and accessing the data ciphertext. The method has the advantages of higher safety, higher flexibility and higher operation efficiency.

Description

technical field [0001] The invention relates to a fine-grained access control method and system based on dual blockchains, belonging to the fields of data security technology and blockchain technology. Background technique [0002] Data circulation and sharing between different users using cloud storage technology can improve business process efficiency and promote business development, but traditional symmetric encryption technology and public key encryption technology are difficult to meet the fine-grained access control requirements of users in cloud storage. How to implement fine-grained access control in data sharing to achieve safe, efficient and controllable data sharing is a hot topic for researchers at home and abroad. [0003] Blockchain technology, as the core technology of digital cryptocurrencies such as Bitcoin and Ethereum, has received extensive attention from researchers in various fields in recent years. The blockchain can solve the problem of trust establ...

AI Technical Summary

Problems solved by technology

[0002] Data circulation and sharing between different users using cloud storage technology can improve business process efficiency and promote business development, but traditional symmetric encryption technology and public key encryption technology are difficult to meet the fine-grained access control requirements of users in cloud storage.

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