Locating Tor hidden services through an interval-based traffic-correlation attack

Lately, research on low-latency communication systems has mainly focused on sender anonymity in order to bypass censorship. But we cannot disregard server anonymity, as it is a necessity to guarantee freedom-of-speech in many countries. For instance, the Electronic Frontier Foundation and Reporters Without Borders advise the use of Tor hidden services (HSes) to protect the safety of dissidents.