Alliance block chain data access control method based on CP-ABE algorithm

Abstract

The invention discloses an alliance blockchain data access control method based on a CP-ABE algorithm, which comprises the following steps: (1) a key generation stage: generating a master key MK and apublic parameter PK in a CP-ABE scheme in the stage, generating a user certificate and an attribute key ciphertext according to a user certificate request, and returning the user certificate and theattribute key ciphertext to a client; (2) a data encryption and chaining stage: in the stage, encrypting private data into a ciphertext by using a CP-ABE scheme, and performing chaining operation on the ciphertext; and (3) an access control stage: after the ciphertext transaction information is requested, the client firstly decrypts the attribute key ciphertext to obtain the attribute key, and further decrypts the ciphertext according to the attribute key to obtain plaintext private data. On the premise of ensuring safe distribution of the user attribute key, the method can be used for effectively realizing privacy protection and encryption access control functions of the uplink data of the super account book block chain.

Description

technical field [0001] The invention relates to a data access control method of an alliance block chain, in particular to a data access control method of an alliance block chain based on a CP-ABE algorithm. Background technique [0002] Blockchain: The concept of blockchain is derived from Bitcoin, which effectively realizes the trust problem between nodes in a decentralized distributed scenario. According to the classification of system control rights and transaction information disclosure, blockchains can be divided into three categories: public (such as Bitcoin, Ethereum, etc.), private chains and alliance chains (such as Hyperledger, etc.). [0003] Hyperledger and Fabric-CA: The consortium chain is represented by the HyperLedger project. Hyperledger is a blockchain technology project initiated by the Linux Foundation, which is dedicated to the development of cross-industry commercial blockchain platform technology. Compared with traditional public chain technology, Hy...

AI Technical Summary

Problems solved by technology

This multi-channel data isolation mechanism greatly enhances the data privacy protection of the hyperledger network, but because it is based on the data isolation protection at the channel level and the synchronization in the channel is still plaintext data, so this mechanism has the granularity of data privacy protection Brutality and the risk of data breaches

In order to solve the above problems, Hyperledger officials further proposed two schemes of data symmetric encryption on-chain and private data mechanism, but the former involves a large number of key generation, distribution and management operations, which makes this scheme not efficient, and the latter in The data synchronized in the authorized node is still plaintext data, so it does not fundamentally solve the security problems caused by data leakage

Images