Research On Quantum Secure Communication Protocol Based On Bell State

In recent years,with the rapid development of information technology,the importance of information security has become increasingly obvious.Compared with classical communication,quantum communication has the characteristics of high efficiency of transmission and unconditional security.Quantum key distribution and quantum secure direct communication are the two main forms of quantum communication.The purpose of the quantum key distribution protocol is to generate a set of secure key sequences that do not transmit secret information,while quantum secure direct communication is a direct transmission of secret,so the security requirements are relatively high.It is found that the secret key sequence generated by the quantum key distribution protocol can be used as a control code sequence,which can be used in quantum secure direct communication,which can improve the security of the scheme,so it is necessary to generate a secure key sequence.Based on the analysis of the classical key agreement,this thesis proposes a secure control code generation scheme,and then uses the idea of control code to propose a quantum secure direct communication scheme of mixed particles.The specific contents of this thesis are as follows:(1)In order to generate a secure sequence of control codes,an identity-based control code generation scheme is proposed.The scheme first uses chaotic encryption technology to encrypt the key sequence generated by BB84 protocol;secondly,uses the characteristics of chaotic system to authenticate the two sides of communication;finally,uses the improved BB84 protocol to transmit the encrypted information sequence,genersting a series of secure control code sequences.Through security analysis and Simulation of the scheme,the results show that the scheme is safe and feasible.(2)To solve the problem of information leakage,a hybrid particle quantum secure communication scheme based on control code is proposed.The scheme uses unitary transformation and control code to ensure the security of the scheme.The control code can control the preparation of quantum states,and the unitary transformation can encode useful information.By analyzing the security,transmission efficiency and MATLAB simulation of the scheme,it shows that the scheme effectively improves the problem of information leakage.At the same time,the transmission efficiency and coding capacity of the scheme are relatively high.Compared with several major protocols,the scheme has certain advantages.