Data security sharing method and system in blockchain and cloud storage environment

Abstract

The invention discloses a data security sharing method and system in a blockchain and cloud storage environment, and belongs to the field of Internet security. According to the invention, the intelligent contract is directly adopted to carry out identity authentication on the data request end, and the cloud server does not participate in authority authentication at any stage, so that the interference of malicious cloud is avoided, and the security of key generation and distribution in an attribute-based access control environment is ensured. According to the method and system, the actual dataciphertext of the user is placed on the cloud server, the metadata information is placed on the blockchain, and the actual data and the metadata are separated, so that bloating of the blockchain is avoided, the consistency of data formats is kept, and storage and query are facilitated. The data ownership end intensively delegates the authority to the intelligent contract, and the data ownership end can change the access control strategy of the data file at any time, so that the user still has the management control right of the data after uploading the data. According to the invention, an attribute encryption scheme based on a ciphertext strategy is used to achieve one-to-many fine-grained access control.

Description

technical field [0001] The invention belongs to the technical field of Internet security, and more specifically relates to a data security sharing method and system in a block chain and cloud storage environment. Background technique [0002] With the continuous development of Internet technology, the exchange of information between different institutions and organizations is gradually increasing, and the degree of data sharing is increasing day by day. At the same time, intelligentization makes mobile terminals rapidly become the key entrance of many Internet services, and data sharing through mobile devices has become an inevitable trend of social development. However, mobile terminals are limited by resources such as power, computing power, and storage power, which also prompts the emergence of cloud services. The security of cloud services is related to the security of a large number of user data privacy, and a little carelessness will cause irreparable consequences. T...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects and improvement needs of the prior art with complex access control, incompletely decentralized operations, and single data storage format, the present invention provides a data security sharing method and system in a blockchain and cloud storage environment, the purpose of which is to Realize fully decentralized operation, and enable fine-grained access control and storage and sharing of different data formats

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