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How to stop the onion denial (of service)

by asn | August 18, 2020

As you might have heard, some onion services have been experiencing issues with denial-of-service (DoS) attacks over the past few years. In this post, we would like to present you with two options that we believe can provide a long-term defense to the problem while maintaining the usability and security of onion services.

  • 46 comments
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What You Can Help Tor Accomplish in 2020

by isabela | December 27, 2019

Hello Tor supporters!

  • 18 comments

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? Is it possible to improve Tor performance without changing protocols? Is it truly possible to deploy Tor at scale? And what would the full integration of Tor and Firefox look like? Those are some of the questions that Mozilla is calling researchers to answer in the privacy & security part of their Mozilla Research Grants program.

  • 41 comments

How to Do Effective and Impactful Tor Research

by chelseakomlo | July 22, 2018

The purpose of this post is to discuss what good research needs to do in order to ensure it has the best chance of being adopted by Tor, or any other large software project.

We have structured this post in terms of an ordered list of goals for research. Each successive goal is more difficult to accomplish than the previous one. At the end of this post, we will look at a positive example of excellent research that successfully accomplished all of these goals and give overall takeaways.

  • 7 comments

Tor's Open Research Topics: 2018 Edition

by mikeperry | July 22, 2018

This post is meant to update the list of open Tor research problems, to bring focus to specific areas of research that the Tor Project thinks are necessary/useful in our efforts to upgrade and improve the Tor network and associated components and software. It is organized by topic area: network performance, network security, censorship circumvention, and application research. Each topic area provides information about current and desired work and ideas. We conclude with information about doing ethical and useful research on Tor and with suggestions on how to best ensure that this work is useful and easy for us to adopt.

  • 13 comments

Announcing the Vanguards Add-On for Onion Services

by asn | July 20, 2018

Fixing the guard discovery problem in Tor itself is an immense project -- primarily because it involves many trade-offs between performance and scalability versus path security, which makes it very hard to pick good defaults for every onion service. Because of this, we have created an add-on that can be used in conjunction with a Tor onion service server or a Tor client that accesses Tor onion services.

  • 45 comments

Take Part in a Study to Help Improve Onion Services

by phw | August 16, 2017

The goal of our study is to understand your expectations, assumptions, and habits when browsing onion services. For example, we are wondering: How do you keep track of onion domains? How do you discover new onion services? How do you know an onion service is legitimate and not an impersonation? By answering these questions, we can identify usability issues and build better anonymity technology.

  • 51 comments

Tor at the Heart: PETS and the Privacy Research Community

by arma | December 21, 2016

During the month of December, we're highlighting other organizations and projects that rely on Tor, build on Tor, or are accomplishing their missions better because Tor exists.

  • 4 comments

Tor at the Heart: Online Collaborative Projects

by aforte | December 19, 2016

During the month of December, we're highlighting other organizations and projects that rely on Tor, build on Tor, or are accomplishing their missions better because Tor exists.

  • 26 comments

A New Bridge Authority

by isis | September 01, 2016

After ten years of volunteer maintenance of Tonga, Tor's bridge Authority—a piece of critical infrastructure within the Tor network—our colleag

  • 38 comments

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Recent Updates

New release candidate: Tor 0.4.5.4-rc

by nickm | January 22, 2021

There's a new release candidate available for download. If you build Tor from source, you can download the source code for 0.4.5.4-rc from the download page on the website. Packages should be available over the coming weeks, with a new alpha Tor Browser release likely around this coming Tuesday.

Tor 0.4.5.4-rc is the second release candidate in its series. It fixes several bugs present in previous releases.

We expect that the stable release will be the same, or almost the same, as this release candidate, unless serious bugs are found.

Changes in version 0.4.5.4-rc - 2021-01-22

  • Major bugfixes (authority, IPv6):
    • Do not consider multiple relays in the same IPv6 /64 network to be sybils. Fixes bug 40243; bugfix on 0.4.5.1-alpha.
  • Major bugfixes (directory cache, performance, windows):
    • Limit the number of items in the consensus diff cache to 64 on Windows. We hope this will mitigate an issue where Windows relay operators reported Tor using 100% CPU, while we investigate better solutions. Fixes bug 24857; bugfix on 0.3.1.1-alpha.

 

New Release: Tor Browser 10.5a7

by sysrqb | January 19, 2021

Tor Browser 10.5a7 is now available from the Tor Browser Alpha download page and also from our

The State of IPv6 support on the Tor network

by gaba | January 14, 2021

In our last article, published in

New Release: Tor Browser 10.0.8

by sysrqb | January 13, 2021

Tor Browser 10.0.8 is now available from the Tor Browser download page and also from our

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