Research On The Dynamic Routing And Application Access In Quantum Cryptography Communication Network

With the advent of technology, social informationization is continuously being improved, information security becomes more and more important. As quantum communication technologies mature, more and more quantum communication networks have been constructed. It has been confirmed that quantum key distribution(QKD) can ensure absolute security of the communication link. Because of its good expansibility and mature research methods, QKD networks with trust relay have been selected as primary schemes when it comes to constructing quantum cryptography communication networks. Therefore, how to utilize efficiently the quantum communication network is of great significance, certainly, the issue of routing in QKD network should be resolved firstly.This thesis focuses on developing an access approach, by which well-developed applications can access to quantum communication network conveniently. In addition,routing in QKD networks has been studied in detail.This thesis is organized as follows. Firstly, the current situation of quantum communication technologies has been introduced. Then we describe quantum mechanics-related knowledge, which ensuring the security of quantum communication.In addition, some typical quantum communication protocols such as BB84 protocol and B92 protocol are reviewed. In the next chapter, some encryption methods in QKD network have been analyzed, and basing on that, we put forward a scheme, in which some existing applications can access to quantum communication networks. After analyzing IP datagrams received from some applications, we will encrypt or decrypt them if necessary, afterwards they will be forwarded into the network. In this way, designing different network equipments is avoided when accessing to quantum communication network. In addition, the efficiency of information transmission is guaranteed and the consumption of the quantum key is reduced. Our scheme has many advantages, it is not necessary to learn various protocols for packaging the datagram in detail. It is easy to distinguish quantum application data and classical application data.In our scheme, classical communication and quantum communication has been merged.At the end of this chapter, we simulate the proposed scheme with Winsock.In chapter four, basing on game theory, we propose a dynamic routing protocol suitable for quantum communication network. In networks, the sender and the receiver are generally seen as one party of the game, and the attacker should be seen as the other party, they achieve different benefits with different strategies. Without loss of generality,mixed strategy is adapted to obtain linear programming equations related to security.After solving equations, optimal strategies and corresponding safety factors can be obtained. We have introduced the concept of remaining keys of different links,according to this value, the link with sufficient remaining keys satisfying requirements of encryption will be selected. Thus dynamic routing is implemented.Finally, some conclusions have been drawn, and also prospect the research content for the next phase. In our present research, IP datagrams are simply processed to complete encryption and decryption tasks. In our future studies, different encryption methods will be selected according to different business, priority and security requirements.Dynamical routing with game theory is based on the assumption of eavesdropping attack in quantum communication network. When referring to various attacks existing in quantum communication network, it is necessary to ensure network security when selecting the optimal routing.