Design And Implementation Of One-Way Transmission System On Mobile Terminals Based On QR Code

Today,when network security issues frequently occur,in order to ensure the internal network information security of the government,the military,enterprises and institutions,and at the same time to allow the internal network to share rich Internet resources,it is important to realize a one-way information path from the external Internet to the internal private network.The current one-way transmission system is implemented based on various tangible or intangible transmission media,and can be simply divided into logical isolation and physical isolation methods.The logical isolation method is realized by special isolation equipment,such as isolation gatekeepers,one-way network cards,etc.,through the isolation device's own scheduling method to achieve one-way communication;the physical isolation method uses intangible carriers as media,such as sound waves,visible light,infrared,etc.There is no physical connection between the equipment to complete the information transmission.Most of the above-mentioned one-way transmission methods need to perform functions with the help of auxiliary equipment.With the development of smart phones and QR code technology,the use of mobile phone cameras to collect QR code images and decode the QR codes to obtain the information,which has become a new way of information transmission.The performance of mobile phone cameras continues to improve,not only can capture images at a higher frame rate,but also ensure the clarity of the images.Based on this,this article uses QR code as the medium of information transmission to build a one-way communication link between two physically separated mobile phones to achieve end-to-end transmission of information.The research content mainly includes the following aspects:First,for the one-way communication function,on the basis of clarifying the system workflow,a transmission protocol suitable for this system is designed,the format of different types of data packets is defined.Designed and implemented key functional modules such as dividing files into blocks at the sending end and receiving data packets at the receiving end.Second,in order to improve system reliability,Reed-Solomon coding is used in transmission to improve system fault tolerance.Analyzing the actual fault tolerance of Reed-Solomon in the system,and determining the gap between the actual fault tolerance of Reed-Solomon and the theoretical fault tolerance through experiments,and providing data support to adjust the fault tolerance in practical applications.In order to ensure the correctness and completeness of the file,a cross-check method is proposed to verify the correctness of the entire data packet sequence.Practice has proved that this method can accurately locate the error data packet in the transmission process.Third,in order to realize the stable and rapid transmission of information,on the basis of clarifying the key parameters of the system,analyzing the relationship between the key parameters.Considering the packet loss rate and information transmission rate comprehensively,a method for determining the best parameters is proposed to achieve high-speed communication.After testing,this method can effectively select the best transmission conditions based on the performance of the transmitter and receiver devices,and achieve efficient and stable communication.