Research Of Non-contact Data Transmission Based On Computer Vision

The law of the People's Republic of China on Guarding State Secrets and the Measures for Security Protection Administration of the International Networking of Computer Information Networks clearly state that computer internal LANs(trusted network)that involve state secrets must not be directly or indirectly connected to the Internet(untrusted network)or other Unsecured network,and the connections must be physically isolated.Although the traditional physical isolation method reduces the risk of leakage,it also makes the necessary information exchange process complicated.Therefore,in order to guarantee the actual time and security of data,this paper presents two solutions for data security transmission between trusted and untrusted networks:First solution: Using a QR(Quick Response)code with a mature technology and widely used market as a carrier for data transmission,a non-contact data transmission system based on QR code is designed.first of all,the untrusted network transmit the data into QR code.Secondly displayed the QR code on an image display device.Then the trusted network use the camera acquires the image and decodes the QR code to obtain information,so that the trusted and untrusted networks complete data transmission in a state of strict physical isolation.Second solution: Using the principle of computer vision,we improved the first solution and proposed a new data encoding method based on computer vision.First of all,we set up standard images,correct and calibration the standard images based on homography matrix,template matching,affine transformation.Secondly according to the text data in the computer's internal coding,the data is converted to a binary format,and lead into the inspection mechanism to generate a new coded image.Then achieve the coded image information extraction through the calibration results of the standard image.Finally use the SSE(Streaming SIMD Extensions)instruction and multithreading technology to optimized the decoding algorithm.Thus completed the data security transmission between trusted and untrusted networks by non-contact methods.The following conclusions were drawn through the experiments:(1)First solution can achieve one-way security transmission of the given data,which has some application value.However,due to the limited capacity of the QR code,and the decoding method is public,it is difficult to meet the daily data update requirements,and not suitable as a carrier for the transmission of confidential information.(2)Compared with the first solution,the second solution has no information loss in the transmission process,the amount of data carried by each image is 6 times that of the original,the transmission speed is 9 times that of the original,it has higher secrecy and can be effectively satisfied the need for daily updating of data by the secret related departments,and solves the problem of computer information exchange between trusted networks and untrusted networks,therefore it is of value in both distinct innovation and practicality research.