A blockchain data access control method and device based on attribute encryption

Abstract

The invention discloses a blockchain data access method based on attribute encryption, which comprises the following steps: when a system is initialized, generating a system parameter based on attribute encryption, a system attribute set and a management parameter based on a time key; when the user registers with the system, the system sends a private key, a signature key, a verification key and an access time period of the user based on the user attribute set to the user; wherein the access time of the user is determined according to the user attribute; when new transaction information is generated, the transaction information is encrypted according to the system attribute set and the time key management parameters to generate a ciphertext, and the ciphertext is stored in the block; and responding to the access request of the user, and accessing the transaction information according to the attribute set of the user and the access time of the user. Therefore, the risk that the user identity information is leaked due to encryption of the user identity information in the prior art is solved, time key management is added, the access time of the user is limited, and automatic revocation of the key is achieved.

Description

technical field [0001] The present invention relates to the field of block chains, in particular to a block chain data access control method and device based on attribute encryption. Background technique [0002] At present, blockchain technology is booming, and blockchain technology has the characteristics of: decentralization, immutability, trustlessness, openness, autonomy, and anonymity. Based on the above characteristics, at present, blockchain technology is usually used to implement access control, that is, to prevent unauthorized access to any resources, so that the system can be used within a legal scope. [0003] However, blockchain-based access control schemes usually cannot guarantee the confidentiality of data. For example, for some sensitive information and information that needs to be kept secret, the data owner hopes that the data will be encrypted and stored in the blockchain, and only those with specific access rights Only the user can decrypt and access th...

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Problems solved by technology

[0003] However, blockchain-based access control schemes usually cannot guarantee the confidentiality of data. For example, for some sensitive information and information that needs to be kept secret, the data owner hopes that the data will be encrypted and stored in the blockchain, and only those with specific access rights Users can decrypt and access the data

[0004] However, under normal circumstances, for the identity-based public key encryption algorithm, the user's public key, private key and identity information correspond one-to-one. If the user's public key and private key are obtained by criminals, the user's identity can be cracked. information, resulting in the leakage of user identity information

[0005] Moreover, the applicant found through research that after the user has the key to access a certain data, the key cannot be revoked, so that after the user's identity changes, the data can still be accessed, so the privacy of the data cannot be guaranteed

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