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Why Tor is slow and what we're going to do about it

by arma | March 13, 2009

I've just finished writing up an explanation of all the various reasons why the Tor network is slow, and what we can do about each.

  • 38 comments

Our three-year development roadmap is published

by phobos | December 19, 2008

We've published our three-year development roadmap.

  • 12 comments

Upcoming Events

June 11, 2019 - June 14, 2019
RightsCon (Tunis)
June 27, 2019 - June 29, 2019
Congresso Abraji (Brasil)
July 16, 2019 - July 20, 2019
PETS (Stockholm)
August 08, 2019 - August 11, 2019
DEF CON (Las Vegas)
August 08, 2019 - August 15, 2019
BornHack (Funen, Denmark)
See All Upcoming Events

Recent Updates

New alpha release: Tor 0.4.1.1-alpha

by nickm | May 22, 2019

There's a new alpha release available for download. If you build Tor from source, you can download the source code for 0.4.1.1-alpha from the usual place on the website. Packages should be available over the coming weeks, with a new alpha Tor Browser release in the next couple of weeks.

Remember, this is an alpha release: you should only run this if you'd like to find and report more bugs than usual.

This is the first alpha in the 0.4.1.x series. It introduces lightweight circuit padding to make some onion-service circuits harder to distinguish, includes a new "authenticated SENDME" feature to make certain denial-of-service attacks more difficult, and improves performance in several areas.

Changes in version 0.4.1.1-alpha - 2019-05-22

  • Major features (circuit padding):
    • Onion service clients now add padding cells at the start of their INTRODUCE and RENDEZVOUS circuits, to make those circuits' traffic look more like general purpose Exit traffic. The overhead for this is 2 extra cells in each direction for RENDEZVOUS circuits, and 1 extra upstream cell and 10 downstream cells for INTRODUCE circuits. This feature is only enabled when also supported by the circuit's middle node. (Clients may specify fixed middle nodes with the MiddleNodes option, and may force-disable this feature with the CircuitPadding torrc.) Closes ticket 28634.
  • Major features (code organization):
    • Tor now includes a generic publish-subscribe message-passing subsystem that we can use to organize intermodule dependencies. We hope to use this to reduce dependencies between modules that don't need to be related, and to generally simplify our codebase. Closes ticket 28226.

 

New Release: Tor Browser 9.0a1

by boklm | May 22, 2019

Tor Browser 9.0a1 is now available from the Tor Browser Alpha download page and also from our

New Release: Tor Browser 8.5

by boklm | May 21, 2019

[Update 5/22/2019 8:18 UTC: Added issue with saved passwords and logins that vanished to Known Issues section.]

Mozilla Research Call: Tune up Tor for Integration and Scale

by gaba | May 08, 2019

What alternative protocol architectures and route selection protocols would offer acceptable gains in Tor performance? Would they preserve Tor properties?

© 2019 The Tor Project

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