Policy hidden type data access control method based on block chain

Abstract

The invention discloses a strategy hiding type data access control method based on a block chain, which ensures the absolute control right of a user on data by utilizing the characteristics of decentralization, automatic execution of an intelligent contract and the like of the block chain, and avoids the risk of user privacy data leakage caused by random viewing of an access control strategy in the block chain. The homomorphic encryption thought is used for reference, the access control strategy can be correctly executed under the hidden condition through the bilinear mapping technology, and the privacy leakage risk caused by the access control strategy is prevented. The method comprises the steps that (1) a blockchain platform executes a group generation algorithm to generate common parameters; (2) a data owner generates personal related parameters through public parameters, constructs an access control strategy tree and publishes the access control strategy tree to the block chain; (3) a data accessor generates an available private key of the data accessor by utilizing the public parameters and the related parameters of the data owner; and (4) the blockchain platform firstly detects the availability of the visitor private key, then performs access control decision on the visitor private key and the data owner access control tree, interacts with the cloud storage service to complete data access if the matching succeeds, and otherwise returns rejection information.

Description

technical field [0001] The invention belongs to the technical field of cloud computing and access control, and in particular relates to a strategy-hiding data access control method based on blockchain. The method utilizes the decentralization and transparency of blockchain and proposes a strategy-hiding technology based on bilinear mapping , which not only guarantees the user's absolute control over the data, but also prevents privacy leakage caused by access control policies. Background technique [0002] With the vigorous development and application of cloud computing technology, outsourced storage of user data, data security and privacy protection issues have become a hot spot of concern. As an important technology to protect data security and prevent unauthorized access, access control has always been an important technology for users to protect data. However, with the explosive growth of user data and the development of cloud storage technology, more and more users Cho...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the third-party service provider is not completely credible and the access control strategy in the blockchain brings privacy leakage to the user, the present invention proposes a method based on The strategy-hidden data access control method of the blockchain introduces blockchain technology and proposes a strategy-hiding technology based on bilinear mapping to ensure the user's absolute control over the data and prevent privacy leakage caused by the access control strategy

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