Analysis on end-to-end node selection probability in Tor network

Tor is an open network that helps to defend against traffic analysis and thus achieves anonymity and resisting censorship online. Nowadays many researches have been carried out to attack Tor and to break the anonymity. To deanonymize the Tor, the attacker must be able to control both the guard node and exit node of a circuit. In this paper, we present an analysis on end-to-end node selection probability when an attacker adds different types of compromised nodes in the existing Tor network. For accurate Tor simulation, we used Shadow simulator for our experiment. By extensive performance evaluation, we conclude that when guard + exit flagged compromised nodes are added to Tor network, the selection probability of compromised nodes gets higher.