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In Pictures: Five ways to beat the Great Firewall ...
Psiphon: This is a Web proxy network developed at the University of Toronto's Citizen Lab that proxies encrypted messages through Psiphon proxies called circumventors. These devices are owned by volunteer participants in Psiphon. This raises security issues because the administrator of one of these proxy nodes could compromise traffic, but the theory behind Psiphon is that the user and the administrator of a node have a trust relationship.
In Pictures: Five ways to beat the Great Firewall of China