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Playlist "28C3: behind enemy lines"

How governments have tried to block Tor

Jacob Appelbaum and 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.