Toward Improving Path Selection in Tor

Tor (The Onion Router) is a popular anonymity overlay network that seeks to provide anonymity without significant cost to performance. Tor's support for anonymity is indeed strong, but its network performance is a problem, and one that is widely recognized. While there are some studies that investigate changing the structure of the Tor network to improve performance, we focus on investigating different path selection strategies given the Tor network as is. Specifically, we explore varying the number of hops in a circuit, varying the performance flags in a circuit, and varying the geographic distance between routers in a circuit. We show how much improvement can be had by reducing the path length, which gives the user guidance on how to trade off anonymity for performance.