Analyzing the Effectiveness of DoS Attacks on Tor

Anonymous communication networks (ACNs) are one of the main building blocks of protecting online privacy. However, such systems have often to deal with performance problems and are also not resilient against attacks. We survey the effect of denial-of-service (DoS) attacks on the performance and anonymity of the well known ACN Tor. Two types of DoS attacks are simulated to investigate the effectiveness of the attacks and the differences between various strategies on applying these attacks are analyzed.