denial of service

Possible upcoming attempts to disable the Tor network

The Tor Project has learned that there may be an attempt to incapacitate our network in the next few days through the seizure of specialized servers in the network called directory authorities.

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New Tor Denial of Service Attacks and Defenses

New work on denial of service in Tor will be presented at NDSS '14 on Tuesday, February 25th, 2014:

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Upcoming Events

August 21, 2019 - August 25, 2019

CCCamp (Germany)

September 12, 2019 - September 13, 2019

APIdays.io (Barcelona)

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Recent Updates

New Release: Tor Browser 9.0a5

Tor Browser 9.0a5 is now available for Android from our distribution directory and

Tor’s Bug Smash Fund: Help Tor smash all the bugs!

Say hello to our Bug Smash Fund.

New release candidate: Tor 0.4.1.4-rc

There's a new release candidate available for download. If you build Tor from source, you can download the source code for 0.4.1.4-rc from the usual place on the website. Packages should be available over the coming weeks, with a new alpha Tor Browser release likely in the next month or so.

Remember, this is just a release candidate: you should only run this if you'd like to find and report bugs.

Tor 0.4.1.4-rc fixes a few bugs from previous versions of Tor, and updates to a new list of fallback directories. If no new bugs are found, the next release in the 0.4.1.x series should be stable.

Changes in version 0.4.1.4-rc - 2019-07-25

Major bugfixes (circuit build, guard):
- When considering upgrading circuits from "waiting for guard" to "open", always ignore circuits that are marked for close. Otherwise, we can end up in the situation where a subsystem is notified that a closing circuit has just opened, leading to undesirable behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
Minor features (continuous integration):
- Our Travis configuration now uses Chutney to run some network integration tests automatically. Closes ticket 29280.

Reflections from Our Stockholm All Hands

This month, the Tor Project held our biannual all hands meeting, this time in Stockholm, Sweden.