Research And Implementation Of Iot Data Service Reputation Evaluation Based On Blockchain

In recent years,with the deployment of iot sensor devices in various fields in real life,massive iot data has been generated.Due to the increasingly mature business model of the Internet of Things,all kinds of Internet of Things data will generate great business value after deeper integration,thus becoming a data asset.However,due to the widespread distribution of iot data,there exists the phenomenon of "data island".In order to realize the interconnection of iot data,data services are formed.In order to represent the quality of the service,a credibility assessment is needed.However,in the existing data service platform and model,the research on data service reputation evaluation is insufficient.In addition,the existing models and platforms have some security problems in the management of reputation data,such as data tampering and single point failure.Blockchain technology has attracted much attention due to its nontamperable,decentralized,distributed and other features.It provides a reliable storage environment for data service reputation assessment data management.For this reason,this paper studied the data service reputation evaluation and key mechanisms of the Io T based on blockchain,and the specific research contents are as follows:First,the research on the reputation evaluation model Io T services.In view of the lack of research on the evaluation of data service providers and data quality reputation in the current data service platform of the Internet of things,this paper according to the characteristics of Io T data,a set of Io T data service reputation evaluation index system was constructed,and the value of the principle layer and the indicator layer was used to analyze and calculate the indicators,and then the credit value of the data service provider was evaluated and calculated.Second,the study on the reputation data management system and key mechanism of IOT data service based on blockchain.Existing data service models often use a centralized architecture for reputation data management,which lacks a trusted and public data management environment.This paper put forward a Reputation Data Management System for Io T data service based on blockchain technology,which stores the Reputation Data in the chain through the organic combination with the Interstar File System,and guarantees the untouchable modification and traceability of Reputation Data.Then the hierarchical architecture of the model was introduced,and the main technologies and functions of each layer were discussed separately.Finally,the user privacy data protection mechanism based on ring signature and the reputation data caching mechanism based on blockchain and Redis were introduced.Third,the design and implementation of the prototype system of data service reputation evaluation based on Io T in Ethereum.The prototype system was implemented based on Ethereum,interstellar file system,SSM framework and other technologies.The prototype system mainly included four modules: account management,rights management,data management and reputation assessment.The functions of data acquisition,data evaluation and reputation evaluation were realized,and the performance test of the prototype system was carried out.The results showed that the model can meet the requirements of the credibility evaluation of Io T data service.