DefenestraTor: Throwing Out Windows in Tor

摘要: Tor is one of the most widely used privacy enhancing technologies for achieving online anonymity and resisting censorship. While conventional wisdom dictates that level offered by increases as its user base grows, significant obstacle to adoption continues be slow performance. We seek enhance Tor's performance offering techniques control congestion improve flow control, thereby reducing unnecessary delays. To reduce congestion, we first evaluate small fixed-size circuit windows a dynamic window adaptively re-sizes in response perceived congestion. these solutions web page times require modification only exit routers, they generally offer poor slower downloads relative current design. To while implement N23, an ATM-style per-link algorithm allows routers explicitly cap their queue lengths signal via back-pressure. Our results show N23 offers better resulting improved faster loads compared design other window-based approaches. also argue our proposals do not enable any new attacks on users'