Blockchain provides trusted services via ledger disclosure and computational transparency,but the openness and transparency features are easy to cause the leakage of sensitive information,which hinders the development of blockchain.Privacy protection technology has become a research hotspot.Different from the public blockchain,consortium blockchain achieves security isolation of network layer and storage layer data via the authority management mechanism to achieve exter-nal intrusion prevention.However,permission control does not support the anonymity of users'identities,and cannot hide amounts of information during the transaction process.Therefore,the existing consortium blockchain platform enhances its privacy protection capabilities by embedding the cryptography function module and trusted hardware.Firstly,this paper in-vestigates the privacy leakage risk faced by the consortium blockchain.Secondly,this paper compares and analyzes the pri-vacy protection technologies involved in the three mainstream consortium blockchain platforms,Hyperledger Fabric,FISCO BCOS and ChainMaker,and compares the privacy protection capabilities of platforms from the perspective of whether it can support identity anonymity,transaction hiding and privacy computing.Finally,this paper points out the research direction of privacy protection technology for consortium blockchain.
维普
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