Block chain data sharing method and device based on LWE-CPABE and storage medium

A data sharing and blockchain technology, applied in the blockchain field, can solve problems such as inability to update policies, reduce difficulty, and inability to solve security problems, save key space costs and encryption time costs, and improve security. , the effect of small amount of calculation

CN114219483AActive Publication Date: 2022-03-22YUNNAN UNIVERSITY OF FINANCE AND ECONOMICS +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-03-22

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Abstract

The invention discloses a block chain data sharing method and device based on LWE-CPABE and a storage medium, and the method comprises the following steps: a data visitor sets an access control strategy, generates a master key and a public key based on the access control strategy, sends the public key to a block chain for storage, the master key entrusts a key center for storage, and the public key entrusts the key center for storage. Data to be published are encrypted into a ciphertext, the ciphertext is uploaded to the third-party storage, and the third-party storage sends a ciphertext storage address to the block chain; the data user obtains the master key from the key center, then synthesizes the master key into a user attribute key, and decrypts the obtained ciphertext by using the user attribute key to complete data sharing; according to the method, the security and the efficiency of data sharing are relatively high, the access control strategy can be conveniently updated, the calculation amount in the updating process is small, and more key space cost and encryption time cost are saved.
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Description

technical field

[0001] The invention belongs to the technical field of block chain, in particular to a block chain data sharing method, equipment and storage medium based on LWE-CPABE. Background technique

[0002] With the continuous popularization of blockchain technology, it has become very popular to use blockchain for data sharing in weak or trustless networks. The privacy data protection on the chain has become a new challenge; in recent years, many scholars have proposed new solutions for privacy protection and data sharing on the blockchain, among which, the attribute-based encryption algorithm is due to its one-to-many encryption and can The advantages of realizing fine-grained access control are widely used in various blockchain solutions, such as data traceability, cloud storage, medical data sharing, and the Internet of Things.

[0003] Attribute-based encryption (ABE) originated from the fuzzy identity-based encryption proposed by Sahai and Waters in 2005, and ...

Examples

Embodiment Construction

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] like figure 1 As mentioned above, the blockchain data sharing method based on LWE-CPABE specifically includes the following steps:

[0048] S1. Set the access control strategy. The data owner DO generates the master key MSK and public key PK based on the LSSS access control strategy, and sends the public key PK to the blockchain BC. The master key MSK entrusts the key center KA to keep it, and based on The public key PK and access control strategy encry...