A blockchain-based distributed data security sharing method, system and computer-readable medium

Abstract

The invention discloses a block chain-based distributed data security sharing method, system and computer-readable medium: output system master key pair and user key pair; encryption; system master key is packaged and uploaded to the block chain ; The master key agent storage node generates the conversion key; the conversion key calculation node generates a new capsule; the data user obtains the master key ciphertext from the blockchain, and obtains the system master key; obtains the attribute private key; The user obtains the shared data ciphertext, enters the attribute private key, and obtains the plaintext through the decryption algorithm. The distributed data security sharing method, system and computer-readable medium based on the block chain of the present invention realize the key encapsulation of the master key by using the distributed proxy key encapsulation mechanism, and solve the security of the master key in the block chain network The problem of distribution and management improves the efficiency of private key generation, and solves the problems of safe distribution and management of the master key in the blockchain network existing in the prior art.

Description

technical field [0001] The invention belongs to the technical field of data security, and relates to a blockchain-based distributed data security sharing method, system and computer-readable medium. Background technique [0002] At present, with the rapid development of information technology, data has become a strategic resource that cannot be separated from the development of all walks of life. However, with the opening and sharing of data, more and more information leakage incidents make the security and privacy of sensitive data a problem that all walks of life must face. An effective way to solve sensitive data security and privacy security is to encrypt data before sharing, but the traditional ciphertext sharing method requires a lot of communication overhead and computing cost. Therefore, using the ciphertext-policy attribute-based encryption (CP-ABE) algorithm, which has the advantages of "one-to-many encryption" and fine-grained access control, can effectively solv...

AI Technical Summary

Problems solved by technology

In order to solve the problems caused by the centralized key center, Gao et al. hide user attributes through homomorphic encryption, and send Proof to the authority for authentication through smart contracts, so as to obtain the master key, and the user generates a private key. key, which realizes distributed key calculation and attribute storage, but its master key is still kept by a centralized organization, which has potential security risks; Zheng Lianghan et al. designed a hierarchical CP-ABE algorithm, which makes all The authority can distribute private keys honestly and in parallel, but its essence is still a multi-centralized authority, which is not well integrated with the blockchain

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