28C3: How governments have tried to block Tor (en)

For more information visit: http://bit.ly/28C3_information
To download the video visit: http://bit.ly/28C3_videos
Playlist 28C3: http://bit.ly/28C3_playlist

Speakers: Jacob Appelbaum | Roger Dingledine

Iran blocked Tor handshakes using Deep Packet Inspection (DPI) in January
2011 and September 2011. Bluecoat tested out a Tor handshake filter in
Syria in June 2011. China has been harvesting and blocking IP addresses
for both public Tor relays and private Tor bridges for years.

Roger Dingledine and Jacob Appelbaum will talk about how exactly these
governments are doing the blocking, both in terms of what signatures they
filter in Tor (and how we've gotten around the blocking in each case),
and what technologies they use to deploy the filters -- including the
use of Western technology to operate the surveillance and censorship
infrastructure in Tunisia (Smartfilter), Syria (Bluecoat), and other
countries. We'll cover what we've learned about the mindset of the censor
operators (who in many cases don't want to block Tor because they use
it!), and how we can measure and track the wide-scale censorship in these
countries. Last, we'll explain Tor's development plans to get ahead of
the address harvesting and handshake DPI arms races.

Category:

Science & Technology

Tags:

• 28c3
• 4800
• en
• how
• governments
• have
• tried
• to
• block
• tor
• h264

[dt9394]

Thanks for the upload!

[ChRiStIaAn008]

@dt9394 you're welcome

[kristofferlc]

I expected to watch about 10-20 min. of this, not knowing what tor was, i ended up watching the whole thing including end questions... I can recommend it...

[ChRiStIaAn008]

@kristofferlc what did you find the most interesting?

[kristofferlc]

@ChRiStIaAn008 The whole talk about the arms race, the different techniques that can be used on both sides to hide/find private information.

[ChRiStIaAn008]

@kristofferlc that's indeed interesting :)

[jmitchener]

What is on his head ...