How governments have tried to block Tor
Jacob Appelbaum and Roger Dingledine
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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.
