Multi-authorization attribute-based verifiable encryption method based on block chain

Abstract

The invention discloses a multi-authorization attribute-based verifiable encryption method based on a block chain, belongs to the technical field of block chain data privacy protection security, and is suitable for one-to-many data sharing and fine-grained access control. The method comprises the following steps: firstly, a data owner uploads encrypted data to a cloud end by using a system public key, and uploads a data ciphertext hash value and an access strategy to a block chain; and the cloud storage server is responsible for receiving and storing the ciphertext. Secondly, the data user receives the attribute key distributed by the multi-attribute authorization center and can verify the correctness of the key; and the block chain performs identity authentication on the data user, and returns an authentication result to the cloud server. And finally, only the legal user whose attribute private key accords with the access strategy can download the data from the cloud and verify whether the data is tampered or not.

Description

technical field [0001] The invention relates to the technical field of blockchain data privacy protection and security. Background technique [0002] With the rapid development of data sharing technology, more and more users store massive data in the cloud, saving local storage space and making it easier to share. However, cloud data leakage incidents occur frequently, and the issue of privacy protection is beginning to face a severe test. The emergence of attribute-based encryption technology provides a new idea for realizing one-to-many encrypted data sharing, which can be widely used in fine-grained access control of shared storage, and has the characteristics of high efficiency, data confidentiality, and collusion resistance. [0003] With the development of blockchain technology, the problems that data in cloud storage may be tampered and integrity cannot be guaranteed have also been better resolved. In recent years, some scholars have combined blockchain with attribu...

AI Technical Summary

Problems solved by technology

[0004] In the research on the attribute-based encryption cloud storage scheme, there are still several problems: (1) The single authorization center not only has a heavy computational burden, but also cannot guarantee the data security in the system due to the inability to resist collusion attacks; (2) The correctness of multi-authority keys cannot be verified at the same time. If there is a wrong private key, all agencies need to resend it; (3) The correctness and integrity of cloud storage data cannot be guaranteed, so a research on a The blockchain-based multi-authorization attribute-based verifiable encryption method is of great significance

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