Research On Security Of Data Exchange Based On Blockchain Technology

In the era of big data,data is regarded as a key resource with various values,such as business intelligence,management efficiency and financial evaluation.Especially as the Internet is highly integrated with other industries,all aspects of people's daily life are generating massive amounts of data.While these data create value for mankind,they also bring security risks,such as difficulty in traceability of data,inability to effectively share data,and poor data reliability.How to realize the effective exchange and sharing of data and how to ensure the security of data is an urgent need to solve.Blockchain technology is an emerging information technology that re-integrates and applies existing data encryption,consensus strategies,digital signatures and other technologies in the Internet.Blockchain technology has significant advantages and broad application prospects in terms of data traceability,poor data reliability,privacy protection and data storage.This paper makes an in-depth study of the existing data exchange model and theory,and discusses its related technology.On the basis of previous studies,a data exchange model based on block chain technology is proposed.In this model,the data publisher can provide the data to the data subscribers through robust data transactions,and at the same time,the data circulating in the model has the characteristics of traceability,tamper-proof,high reliability and so on.The data transaction realized by the digital data exchange system based on the block chain can enable the transaction conditions to be specified and executed by the data publisher or the data subscriber.The data transactions realized by the digital data exchange system based on the block chain can also be traced in a reliable distributed manner,so that it can be traced back to the entity that improperly accesses the data.On the basis of the theoretical model,an example of data exchange(picture certificate)based on block chain technology is built,and the example is used to demonstrate the security of the proposed theoretical model.In the example,TLS technology and digital signature are used to ensure the security of data in the process of transmission,and distributed storage is used to avoid the security risk brought by central storage.The example determines whether the data(picture)has been tampered with or not is based on whether the digital fingerprint(hash value of the data)of the data before upload and after download is consistent.Through the demonstration of an example,the digital fingerprints of the data(pictures)before and after the data are the same,and the proposed data exchange model based on block chain technology is superior to the traditional data exchange model in terms of security.