Decentralized Secure Data Sharing Platform Based On Blockchain

With the development of information technology,the big data industry is facing the dilemma of "everyone has data,everyone lacks data".It is of great theoretical and practical significance to establish a reasonable,efficient and secure data sharing model for promoting data security sharing.This paper analyzes and investigates the multiparty data sharing model,and believes that most of the traditional schemes are based on the third-party cloud services.The data storage and transmission media of these schemes have the disadvantage of too centralized data,prone to single point of failure and data security problems,and the storage and download need to pay a high cost.In the traditional data sharing scheme based on public key encryption,the data sharing party needs to use the public key of different data requesters to encrypt a large number of data repeatedly,which is inefficient for data storage nodes.Based on the study of blockchain theory and technology and the in-depth study of data sharing technology,this paper proposes a completely decentralized data sharing scheme based on blockchain technology,threshold proxy re-encryption technology and IPFS technology,which allows data sharing safely without any third-party service provider.In this scheme,blockchain technology is used to overcome the single point of failure of traditional data sharing methods;threshold proxy re-encryption mechanism is used to solve the problem of low efficiency of encryption in multi-party data sharing scenarios,and to ensure data security and reduce the risk of collusion;IPFS technology is used to solve the problem of large data storage cost in blockchain,and improve data transmission in multi-party data sharing scenarios and provide decentralized access mechanism for the scheme.The correctness of the sharing scheme and the effectiveness of the sharing platform are verified by the comparison and analysis of several groups of experiments.Among them,the data encryption method based on the threshold proxy re-encryption technology significantly improves the data encryption performance in multi-party data sharing scenarios.The data transmission mechanism based on IPFS improves the data transmission performance in the multi-point download scenarios.