Monitoring Data Access And Query System Based On Block Chain Technology

With the development and progress of society,monitoring which is a means of protection is becoming more and more common in people's lives.The use of monitoring data can better restore the real situation and prevent fraud and accidents.However,the fraudulent behavior against the monitoring data itself is prone to occur in the traditional monitoring data collection,storage,and query process,especially when the monitoring data involves multiple stakeholders,the party that masters the monitoring data has the motivation to satisfy its own interests and will destroy or tamper the monitoring data,which result in mistrust between participating parties in a multi-participatory monitoring environment.In response to this problem,there are also some traditional solutions.This thesis analyzes the shortcomings of these solutions and proposes a solution that combines emerging Blockchain technology with embedded technology,which can ensure data security and privacy.Such method solve the problem of mistrust between participants under the conditions of multi-participation.Based on video surveillance data and RFID data,this thesis uses ARM embedded platform and Ethereum Blockchain,and integrate with video surveillance,smart contract and other technologies to complete the collection,processing,uploading and storage of monitoring data;The data collection mainly uses V4L2 video capture technology and RFID technology,the captured video data is compressed by H.264 video coding technology,and matched with the collected electronic tag information;The embedded platform uploads the collected data to the server by using the TCP protocol.The server processes the data,and it can be guaranteed that the data can exist and can not be tampered with and the data content can be protected from being leaked by calculating the data digest form,thereby maintaining the data security and privacy;the processed data will be stored in the Blockchain,the storage module on the chain is written in smart contract,and the data stored in the Blockchain can prevent any participant from changing or destroying the data digest.All participants can publicly query these data digest on the Blockchain.