The Paper “50 Bucks Attack on Tor” has been accepted

The paper “50 Bucks Attack on Tor“, submitted as short paper to NordSec, has been accepted. In the paper, we look on Tor’s attacker model from a more practical side and assume a local network administrator as a potential adversary. In addition, we assume that the attacker has 50 € available for operating a Tor relay. The question of the paper is: How long does Tor protect the user’s favorite websites given our scenario. We answer this question by providing a stochastical model estimating the number of circuits required to deanonymize n favorite websites of the user. By simulating the path selection algorithm with a current Tor network state, we demonstrate the feasibility of the attack.