obfsproxy is a tool that attempts to circumvent censorship, by transforming the Tor traffic between the client and the bridge. This way, censors, who usually monitor traffic between the client and the bridge, will see innocent-looking transformed traffic instead of the actual Tor traffic.
obfsproxy supports multiple protocols, called pluggable transports, which specify how the traffic is transformed. For example, there might be a HTTP transport which transforms Tor traffic to look like regular HTTP traffic. See the pluggable transports page for more information.
Even though obfsproxy is a separate application, completely independent from tor, it speaks to tor using an internal protocol to minimize necessary end-user configuration.
Please open a ticket
on our bug tracker for any bugs you find or features you would
like to see added in future releases.
Also feel free to look or poke at the source code and send us back any improvements you make.
We've been making experimental bundles that include obfsproxy and are specially designed to circumvent censorship. You can download them from the pluggable transports page.
To set up an obfsproxy bridge on a Debian/Ubuntu machine, see the separate Obfsproxy Debian/Ubuntu Installation Instructions page.
To set up obfsproxy from source, see the separate Obfsproxy Installation Instructions page.