Research On Security And Transmission Performance Optimization Of Quantum Noise Encryption System

In the traditional optical communication encryption technology,high complexity algorithms and mathematical problems are often used to protect information from eavesdropping or leakage,which is more dependent on the computing power of the computer.However,the rapid development of quantum computing in recent years has posed a serious threat to traditional encryption schemes,and computing power cannot become an important guarantee of security.The impenetrable and other properties of quantum noise during transmission provide a new direction for optical fiber communication encryption technology and become a hot research topic of secure communication.Based on the quantum noise encryption system,this paper aims at improving its transmission performance,security performance and transmission efficiency.Based on the existing QNSC encryption and coding technology,the quantum noise flow encryption technology based on gray code and quantum noise flow encryption technology based on bit-xOR are proposed.The security performance,transmission performance and key utilization rate of the two schemes in the transmission process are analyzed and discussed in detail.The two main research options are:1)In the current QNSC transmission system,each position of the ciphertext sequence is not evenly affected by noise in the transmission process,which leads to the risk of leakage of high-order data in the ciphertext.Eavesdroppers will recover the transmission key of the communication parties according to the integrity of the high-order information.This paper proposes a QNSC method based on gray code.After y-00 encryption mapping of information bits,irregular gray code mapping is carried out again,which makes the transmission system realize secure transmission without increasing system redundancy.Then,a 300km IM/DD-OFDM transmission system was built to verify the proposed scheme,which proved that the scheme could further improve transmission security without affecting transmission performance.2)in view of the existing QNSC transmission system,the external key generation rate compared with the existing QNSC optical communication can realize the transfer rate is low,cause the existing transmission system in the process of encryption and can’t achieve real one at a time,this kind of situation limits the security of the existing transmission system,this paper proposes a method based on vision or QNSC,To avoid the leakage of the original high-order data generated by the linear shift register,the original key low-order data is xOR placed in the high-order data.The scheme reduces the utilization rate of the key and enhances the transmission security of the system.Then,the QNSC simulation system of IM/DD-OFDM is built to simulate and analyze the proposed encryption scheme.The final results prove that the scheme can further realize secure transmission on the basis of reducing the key utilization rate.