Research On Routing Technology Of Quantum Key Distribution Network Based On Application Demands

Nowdays,information technology is developing rapidly and data is flooding in people’s daily life,so it is important to protect users’ privacy and security in the network.Communication networks that rely on traditional cryptography for key exchange are no longer able to withstand the serious challenges posed by quantum computing.Quantum Key Distribution(QKD)technology can achieve theoretically unconditional secure and confidential communication by virtue of quantum characteristics,and will become a key technology in the field of information security in the future.QKD network,as the underlying foundation of quantum confidential communication,has many differences compared with traditional communication network,so it cannot copy the operation mechanism of traditional network in the process of building.With the increasing scale of QKD networks,how to choose the optimal path for key relaying becomes the key to the network efficiency.To address the above problems,the main research work and findings of this thesis are as follows.(1)To address the problems of high pressure of quantum node data processing,insufficient link state analysis and unreasonable link cost calculation in the existing QKD network routing scheme,we propose an Application Deamnd Addaptive Quantum Key Distribution Network(ADA-QKDN)routing scheme.The scheme introduces the software-defined idea of unifying the collection and construction of QKD network topology information to the routing management center,thus reducing the computational pressure of quantum nodes.Then,the scheme takes the key demand of application as an important measure when formulating the routing policy,and the RMC adaptively changes the current routing policy according to the characteristics of the application requirements,thus affecting the calculation of link cost and path cost.Finally,the simulation results show that the ADA-QKDN scheme can handle application key requests better than existing schemes,and the performance is stable during the dynamic change of request parameters,and the success rate of application key requests is improved by at least 10%.(2)For the special high concurrency scenario where a large number of application key requests arrive in a short time and the key demand varies greatly among applications,we propose an Application Priority Sorted Quantum Key Distribution Network(APS-QKDN)routing scheme.The scheme prioritizes a large number of concurrent requests by considering the application’s own priority,the total application key demand and the key update rate,and improves the resource utilization and service efficiency of the network by adjusting the processing order of application key requests.Second,the request queuing strategy takes into account the current network resource situation and the key demand characteristics of application,and the same key request can adopt different evaluation strategies under different network resource environments.Finally,the performance of APS-QKDN is compared with the existing scheme through simulation experiments,and the results show that the success rate of application key request of APS-QKDN scheme is improved by at least 15% under the special scenario of high concurrency.(3)In this thesis,a QKD network routing scheme verification system is designed,which can provide visual feedback on the performance of each scheme.The system contains five modules,namely,request parameter setting module,link resource display module,key request display module,key request response module,request success rate and key efficiency graphical display module.The underlying network topology of the verification system is based on the quantum metropolitan area network(QMN)architecture now in use in Beijing.The overall interface of the system and the display contents of each module are described in detail,and the performance of ADA-QKDN and APS-QKDN schemes are verified.