Design And Implementation Of An Anonymous Communication System Based On SDN

In recent years,with the development of Internet technology,the issue of network privacy security has received more and more attention.In addition to privacy issues for information content,privacy of communication relationships between users also needs to be strongly protected.The concept of anonymous communication is proposed to protect the identity information of both parties and the connection between the two ends of network communication.However,the traditional anonymous communication system still faces the problems of anonymity and network performance and cannot adapt to the current network requirements,so it is urgent to propose a new anonymous communication method.Inspired by the moving target defense technology and the centralized control concept in SDN,this thesis proposes an anonymous communication method based on random identification.On the one hand,the method uses a routing method different from the traditional routing protocol.With the centralized control feature of SDN,a new routing forwarding table is calculated for the network,which ensures the communication capability of the network.On the other hand,the algorithm combines the moving target defense strategy,and moves the attack surface of the network to interfere with the attacker's sniffing of the network communication relationship,thereby achieving the purpose of network anonymity.This thesis first introduces the relevant research background,analyzes the development status,characteristics and deficiencies of the traditional anonymous system,and then summarizes the requirements of the new anonymous communication system.Then combined with SDN network architecture and moving target defense method,an anonymous communication algorithm based on random identifier is proposed.Based on the algorithm,a new anonymous communication system is designed.The system is divided according to the functional modules and the functions and tasks of each module are elaborated.Next,the specific implementation process of each module and interactive interface of the system is introduced.Finally,a detailed system test scheme is given to verify the effectiveness and practicability of the anonymous communication system.