| Blockchain,as an emerging storage technology,has the characteristics of decentralization,data openness and transparency,traceability of sources,tamper-proof and so on.It solves the problems existing in the current centralized storage technology,such as single node failure,data storage insecurity and sharing difficulties.However,as a public distributed storage ledger,user identity security,on-chain data privacy security and low data storage efficiency have become the pain points of this technology,especially for the enterprise-level consortium blockchain,data privacy and storage efficiency are particularly important.In recent years,researchers have proposed some privacy protection and data storage schemes on blockchain,but these schemes tend to greatly increase the computing cost of the system and reduce the reliability of the data,making the system performance unable to meet the requirements of usage scenarios.Therefore,the effective solution to privacy protection and storage efficiency in the consortium blockchain is the key to accelerate the practical application of the consortium blockchain.Aiming at the privacy protection problem in the consortium blockchain,this paper studies the two technical aspects of identity privacy protection and data privacy protection respectively.In the data privacy protection,the problem of data storage efficiency is solved as well as the problem of data privacy protection by means of technology integration.The specific research contents are as follows:(1)A two-level certificate identity protection scheme based on PKI system is proposed.Compared with the common anonymous authentication scheme,this scheme realizes the decentralized supervision between the platform regulator and the certificate issuer and the anonymous certificate identity tracking mechanism,which can solve the security problems such as single point attack and anonymous abuse.In terms of efficiency,the computation of anonymous certificates in the generation phase is significantly reduced and the storage space is saved.It provides a secure and flexible identity privacy protection scheme for the consortium blockchain.(2)The combination of AONT and RS erasure code technology is applied in the field of blockchain.On the one hand,AONT encryption technology is completely inseparable,which can solve the security problems of decentralized data storage vulnerable to selective ciphertext attack and collusion of multiple malicious nodes.At the same time,the introduced RS erasure code technology can not only ensure the reliability of the data,but also greatly improve the storage efficiency of the data on the chain,and solve the storage problem caused by the infinite expansion of the data on the chain.(3)Based on Hyperledger Fabric,the consortium blockchain platform with the most actual projects,a complete system model is constructed.Combined with the mechanism of member access,transaction distribution ordering and transaction verification in Fabric system,the above technologies are realized in the platform. |
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