deterministic builds

Tor at the Reproducible Builds Workshop in Athens 2015

Being able to build Tor Browser several times in a row and getting exactly the same result each time has been an

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Tor Browser Bundle 3.0beta1 Released

The first beta release in the 3.0 series of the Tor Browser Bundle is now available from the Tor Package Archive:

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Deterministic Builds Part Two: Technical Details

This is the second post in a two-part series on the build security improvements in the Tor Browser Bundle 3.0 release cycle

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Tor Browser Bundle 3.0alpha4 Released

The third alpha release in the 3.0 series of the Tor Browser Bundle is now available from the Tor Package Archive:

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Deterministic Builds Part One: Cyberwar and Global Compromise

I've spent the past few months developing a new build system for the 3.0 series of the Tor Browser Bundle that produces

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Tor Browser Bundle 3.0alpha3 Released

The third alpha release in the 3.0 series of the Tor Browser Bundle is now available from the Tor Package Archive:

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Tor Browser Bundle 3.0alpha2 Released

The second alpha release in the 3.0 series of the Tor Browser Bundle is now available from the

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Recent Updates

Strength in Numbers: An Onion Blooms

Strength in Numbers: Growing Our Board of Directors

This is a series of blogs to complement our 2018 crowdfunding campaign, Strength in Numbers.

New release: Tor 0.3.5.4-alpha

There's a new alpha release available for download. If you build Tor from source, you can download the source code for 0.3.5.4-alpha from the usual place on the website. Packages should be available over the coming weeks, with a new alpha Tor Browser release by mid-December.

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

Tor 0.3.5.4-alpha includes numerous bugfixes on earlier versions and improves our continuous integration support. It continues our attempts to stabilize this alpha branch and build it into a foundation for an acceptable long-term-support release.

Changes in version 0.3.5.4-alpha - 2018-11-08

Major bugfixes (compilation, rust):
- Rust tests can now build and run successfully with the --enable-fragile-hardening option enabled. Doing this currently requires the rust beta channel; it will be possible with stable rust once Rust version 1.31 is released. Patch from Alex Crichton. Fixes bugs 27272, 27273, and 27274. Bugfix on 0.3.1.1-alpha.
Major bugfixes (embedding, main loop):
- When DisableNetwork becomes set, actually disable periodic events that are already enabled. (Previously, we would refrain from enabling new ones, but we would leave the old ones turned on.) Fixes bug 28348; bugfix on 0.3.4.1-alpha.

New release: Tor 0.3.4.9

We have a new stable release today. If you build Tor from source, you can download the source code for Tor 0.3.4.9 from the download page on the website. Packages should be available within the next several weeks, with a new Tor Browser by mid-December.

Tor 0.3.4.9 is the second stable release in its series; it backports numerous fixes, including a fix for a bandwidth management bug that was causing memory exhaustion on relays. Anyone running an earlier version of Tor 0.3.4.9 should upgrade.

Changes in version 0.3.4.9 - 2018-11-02

Major bugfixes (compilation, backport from 0.3.5.3-alpha):
- Fix compilation on ARM (and other less-used CPUs) when compiling with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
Major bugfixes (mainloop, bootstrap, backport from 0.3.5.3-alpha):
- Make sure Tor bootstraps and works properly if only the ControlPort is set. Prior to this fix, Tor would only bootstrap when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.