Research On Security Enhancement Technology In Quantum Noise Stream Cipher System

At present,with the rapid development of cloud computing and big data,the amount of mission-critical and sensitive data transmitted over optical networks is also increasing dramatically,and protect user data and privacy has become a very important task.Therefore,quantum noise stream cipher technology,as a secret technology with high potential,fully covers information by introducing quantum noise and amplifying self-radiated noise,and utilizes true randomness and complexity in physical sense.It lays a solid foundation for the secure transmission of information and has a wide range of application prospects under this background.However,with the evolution of eavesdropping technology,illegal eavesdropping can attack the quantum noise stream encryption system through the corresponding technical means,and the security threat of quantum noise stream encryption system is more and more serious.In this paper,the development status and research hotspot of optical fiber physical layer security transmission technology at home and abroad are extensively investigated,and the key technologies in quantum noise stream encryption system are analyzed.In order to further improve the security capability of quantum noise stream encryption system,the main research and innovation points of this paper are as follows:(1)A security enhancement scheme of quantum noise stream encryption system based on key correlation protection is proposed,and the principle and method of eavesdropping party’s theft attack on the quantum noise stream encryption system are introduced.A 300km quantum noise stream encryption simulation system is built to test the security performance.The test results show that all the illegal attacks of the eavesdropper fail.Compared with the original scheme,the bit error rate is lower than the soft decision threshold of 4E-2.The OSNR-BER curve of the new scheme shows that the bit error rate of the eavesdropping party is around 0.5,which enhances the security of the system.(2)A security enhancement scheme for quantum noise stream encryption system based on noise enhancement is proposed,and the calculation method of noise cover number of quantum noise and amplified self-radiated noise in quantum noise stream encryption system is introduced.By increasing the magnitude of amplified self-radiated noise in the system,the security capability of the system is improved.At the same time,the quantum noise stream encryption simulation system is built for testing.The results show that when the encryption order is 8 and the noise index is 3 and 7dB,the noise index is 976.4 and 1606.2,respectively.When the encryption order is 10 and the noise index is 3 and 7dB respectively,the noise masking number is 16615 and 23881,and the noise masking number is greatly increased compared with before.When the noise index is 7dB,the detection failure probability of the eavesdropping party is 99.99%.At the same time,the transmission capacity of the system under different amplifying selfradiated noise is tested,and the loss of Q factor and OSNR is analyzed.