Research On Secure Sharing And Access Control Of Cross-border Trade Data Based On Blockchain

How to ensure the cross-border trade document data sharing in a more secure way has become the research focus in the field of trade all over the world,and it is also the key and focus of paperless trade construction.Traditional cross-border trade relies on the "single window" to achieve paperless process.However,in the process of declaration and inspection of trade documents such as certificate of origin,letter of credit and inspection and quarantine certificate to customs,banks,insurance and other institutions,all parties still use the traditional paper-based method to exchange documents.As the paper-based documents are easy to be forged and tampered,the data exchange process is greatly reduced The security of the system.Therefore,the core of cross-border trade is to ensure the safe sharing and access control of data while realizing the digitization of trade document data.Through the deep integration of cryptography technology,P2 P network and intelligent contract technology,blockchain constructs a decentralized distributed trust network.All nodes in the network participate in accounting together,realizing the characteristics of information flow,such as non tampering,traceability and transparency.At the same time,each node can complete the point-to-point value transfer.Blockchain realizes the simple sharing of data,but it can not guarantee the security of data.In order to build a safe and practical cross-border trade document data security sharing model,combined with the analysis and summary of research status at home and abroad,it is found that at present,it is mainly combined with blockchain technology to solve the problems of data sharing difficulty and data privacy security from two aspects of access control authority and information encryption.To sum up,combined with access control technology and blockchain technology,cross-border trade data security sharing can be realized.This paper constructs the trade blockchain to ensure the traceability and audit of document data,in this basis,proposes an access control scheme based on cryptography to ensure the security of data transmission,and designs an intelligent contract composed of automatic execution script code to realize the automatic execution of transaction process.Finally,through the simulation experiment,the blockchain system built by the system analysis model has high security and practicability,which verifies that the model has high feasibility and use value.