Research And Implementation Of Fiber Key Agreement Scheme Based On Channel Lookback Measurement

With the innovation of the Internet,mobile communications,and data and information technology,huge market demand has driven the rapid development of the optical communications industry.However,optical fiber communication,as an infrastructure for carrying information,faces serious threats during the secure transmission process.As the classic encryption algorithm technology is increasingly threatened by quantum computing,the quantum key distribution algorithm has the problems of short transmission distance and high sensitivity to devices.Therefore,how to break through the limitations of generating keys based on mathematical problems and establish a more secure key distribution system has become a hot issue in the industry.This paper has conducted extensive research on the development status and research hotspots of physical layer key distribution technology at home and abroad.The state-based encryption technology in quantum noise stream encryption is used to extract the channel characteristics,which provides a reliable solution for the security of optical fiber physical layer Program.The main research work of this article are as follows:1.A key agreement scheme based on quantum noise state-based pattern matching is proposed,which uses the quantum noise stream to encrypt the characteristics of multiple dimensions of multiple orders.The key is generated through its state basis.The experimental results show that the scheme can achieve a maximum rate of 400kbps in a 160km fiber link,and the key consistency is higher than 98%key distribution.2.A loop-back self-key negotiation scheme based on channel error rate feature extraction is proposed.The quantum noise flow mapping principle is used to extract the bit error rate change in the fiber channel to generate the key.The experimental results show that the scheme can be used in 200km.The optical fiber link achieves a key distribution rate of 1Mbps and key consistency of 98%.3.Participate in the construction of a digital processing platform and experimental system platform based on coherent optical communication,which provides a verification basis for studying the key performance in the fiber key agreement scheme based on channel loopback measurement.