Anonymity of Tor network based on weighted bandwidth

• 1、School of Computer Science (National Pilot Software Engineering School), Beijing University of Posts and Telecommunications, Beijing 100876

Abstract：Anonymous communication system is becoming more and more popular as a tool to protect users\' network privacy, among which the second generation of onion routing network Tor is the most successful case of low delay anonymous network system.Anonymity security of Tor network has always been a research hotspot.From the point of view that the attacker occupies a certain bandwidth budget, a method to estimate the anonymity of Tor network is proposed by calculating the proportion of the attacker\'s weighted bandwidth to the total weighted bandwidth.In this paper, on the basis of predecessors\' research analyses the Tor network bandwidth weighted random selection algorithm and build the process of threat model, this paper expounds the model put forward by the predecessors\' existing deficiencies, proposed from different locations in the Tor network users build a communication link to improve the measurement formula for computing the probability of attack, gives theoretical proofs of the model.The active node information was collected from the historical data of Tor network to compile simulation experiments, run comparative experiments and verify the theoretical calculation results.The feasibility of calculating the weighted bandwidth probability to estimate the anonymity of Tor network is demonstrated theoretically and experimentally.

Keywords： software engineering Tor network Anonymous Weighted bandwidth Network link