Distributed data security sharing method and system based on block chain, and computer readable medium

Abstract

The invention discloses a distributed data security sharing method and system based on a block chain, and a computer readable medium. The method comprises the following steps: outputting a system master key pair and a user key pair; performing encryption; packaging and then uploading the system master key to the block chain; generating a conversion key by the master key agency storage node; converting the key calculation node to generate a new capsule; obtaining the master key ciphertext from the block chain by the data user and obtaining the system master key; obtaining an attribute private key; and obtaining the shared data ciphertext by the data user, inputting the attribute private key, and obtaining the plaintext through a decryption algorithm. According to the distributed data security sharing method and system based on the block chain, and the computer readable medium, key encapsulation of the master key is realized by using a distributed proxy key encapsulation mechanism, the problem of secure distribution and management of the master key in a block chain network is solved, the generation efficiency of the private key is improved, and the problems of safe distribution and management of the master key in the block chain network and the like in the prior art are solved.

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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