Control chart tests based on geometric moving averages
Technometrics
Scalability and accuracy in a large-scale network emulator
ACM SIGOPS Operating Systems Review - OSDI '02: Proceedings of the 5th symposium on Operating systems design and implementation
Low-Cost Traffic Analysis of Tor
SP '05 Proceedings of the 2005 IEEE Symposium on Security and Privacy
Shining Light in Dark Places: Understanding the Tor Network
PETS '08 Proceedings of the 8th international symposium on Privacy Enhancing Technologies
A practical congestion attack on tor using long paths
SSYM'09 Proceedings of the 18th conference on USENIX security symposium
Improving tor using a TCP-over-DTLS tunnel
SSYM'09 Proceedings of the 18th conference on USENIX security symposium
An improved algorithm for tor circuit scheduling
Proceedings of the 17th ACM conference on Computer and communications security
Digging into Anonymous Traffic: A Deep Analysis of the Tor Anonymizing Network
NSS '10 Proceedings of the 2010 Fourth International Conference on Network and System Security
Managing data transfers in computer clusters with orchestra
Proceedings of the ACM SIGCOMM 2011 conference
ExperimenTor: a testbed for safe and realistic tor experimentation
CSET'11 Proceedings of the 4th conference on Cyber security experimentation and test
Tor is unfair -- And what to do about it
LCN '11 Proceedings of the 2011 IEEE 36th Conference on Local Computer Networks
Throttling Tor bandwidth parasites
Security'12 Proceedings of the 21st USENIX conference on Security symposium
PCTCP: per-circuit TCP-over-IPsec transport for anonymous communication overlay networks
Proceedings of the 2013 ACM SIGSAC conference on Computer & communications security
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Tor is an onion routing network that protects users' privacy by relaying traffic through a series of nodes that run Tor software. As a consequence of the anonymity that it provides, Tor is used for many purposes. According to several measurement studies, a small fraction of users using Tor for bulk downloads account for the majority of traffic on the Tor network. These bulk downloads cause delays for interactive traffic, as many different circuits share bandwidth across each pair of nodes. The resulting delays discourage people from using Tor for normal web activity. We propose a potential solution to this problem: separate interactive and bulk traffic onto two different TCP connections between each pair of nodes. Previous proposals to improve Tor's performance for interactive traffic have focused on prioritizing traffic from less active circuits; however, these prioritization approaches are limited in the benefit they can provide, as they can only affect delays due to traffic processing in Tor itself. Our approach provides a simple way to reduce delays due to additional factors external to Tor, such as the effects of TCP congestion control and queuing of interactive traffic behind bulk traffic in buffers. We evaluate our proposal by simulating traffic using several methods and show that Torchestra provides up to 32% reduction in delays for interactive traffic compared to the Tor traffic prioritization scheme of Tang and Goldberg [18] and up to 40% decrease in delays when compared to vanilla Tor.