Research Of Anonymous Communication Tracking Scheme Based On SDN

Anonymous communication technology has caused great difficulties in the investigation of cybercrime,which seriously threatens citizens and social security.In the traditional network structure,it will be a very complicated and time-consuming task if the configuration of the device needs to be modified after the network device is deployed.The traditional network flow watermarking anonymous communication tracking technology needs to add additional equipment to the network to take over the entire network traffic.This will result in additional resource consumption and be prone to alerting offenders.Therefore,it has not been possible to implement applications on a large scale.In this paper,we studied an anonymous communication tracking scheme based on a software-defined network(SDN).By combining the great architecture of software-defined networks and the network flow watermarking technology,this paper proposes a new type of anonymous communication tracking model.It can effectively solve the problem of device deployment and further improve the anti-detection ability of the watermark.This paper first investigates and analyzes the current situation on international and domestic researches of anonymous communication tracking technology,and expands the research to settle existing problems.Then,in order to solve the difficulty of deployment of the traditional network flow watermark tracking technology,this paper builds an anonymous communication tracking model based on SDN architecture.And then,formalize the architecture.Next,this paper proposes a coding and embedding scheme for network flow watermarking under the SDN architecture.It converts key information to the watermark.This paper improves the watermark's error correction capability and channel capacity by combining convolutional codes and L-bits to N-packets models.At the same time,this paper also proposes an anti-jamming processing mechanism that can reduce the impact of network jitter on the watermark.Finally,this paper proposes a watermark anti-detection scheme.Through the distribution simulation mechanism,the watermark delay sequence is simulated as the distribution state of the normal data flow.Moreover,this paper also introduces the concept of jump protection to achieve the dynamic transition synchronization of the coding mapping relationship which reduces the possibility of being discovered by the attacker,and improves the anti-detection ability of the watermark.So that it can track the anonymous communication hiddenly in most network environments.Based on the above theoretical research work,this paper implements an anonymous communication tracking system based on SDN.We then tested the accuracy,false alarm rate,and detection resistance ability of tracking watermarks.The experimental results show that it has higher detection rate and low false alarm rate,and it has excellent anti-detection ability.So that it can efficiently and secretly track anonymous communications.