[tor-dev] A Child's Garden of Pluggable Transports

Lunar lunar at torproject.org
Wed May 21 09:13:39 UTC 2014

David Fifield:
> Have you ever wondered what makes the Tor protocol fingerprintable, and
> makes pluggable transports necessary? Have you wondered how obfs3
> obscures byte patterns in Tor? What a flash proxy WebSocket connection
> actually looks like, and why it defeats IP blocking but not DPI?
> Then I have the wiki page for you:
> https://trac.torproject.org/projects/tor/wiki/doc/AChildsGardenOfPluggableTransports
> It's a visualization of different pluggable transports, meant to be an
> aid to understanding. At the top is an ordinary Tor handshake, with some
> fingerprintable data fields highlighted. The following sections, one for
> each transport, show how those fields are hidden--or not. I tried to
> demonstrate aspects of different transports that I think are hard to
> intuit, such as what flash proxy rendezvous looks like, and how
> transports look under the encrypted layer that is visible to a censor.

This is a beautiful and helpful piece of work. Thank you!

Lunar                                             <lunar at torproject.org>
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