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Ultrasurf
UltraSurf is a freeware Internet censorship circumvention product created by UltraReach Internet Corporation. The software enables its users to bypass Internet censorship and firewalls using an HTTP proxy server, and employs encryption protocols for privacy.
The software was developed by Chinese dissidents as a means of allowing internet users to bypass the Great Firewall of China. It currently boasts as many as 11 million users worldwide. The tool has been lauded as "one of the most important free-speech tools on the Internet" by ''Wired'', and as the "best performing" circumvention tool by Harvard University in a 2007 study; a 2011 study by Freedom House ranked it fourth. Critics in the open source community have expressed concern about the software's closed-source nature and alleged security through obscurity design; UltraReach says their security considerations mean they prefer third party expert review to open source review.〔UltraSurf, ("Tor's critique of UltraSurf: A reply from the UltraSurf developers" ), 16 April 2012. Retrieved 28 April 2012.〕
==Overview==
In 2002 UltraReach was founded by Chinese dissidents in Silicon Valley. Shortly after, UltraSurf was created to allow internet users in China to evade government censorship and monitoring.〔Vince Beiser, (Digital Weapons Help Dissidents Punch Holes in China's Great Firewall ), ''Wired'', 1 November 2010.〕 As of 2011 UltraSurf reported over eleven million users worldwide.〔 During the Arab Spring, UltraReach recorded a 700 percent spike in traffic from Tunisia.〔 Similar traffic spikes occur frequently during times of unrest in other regions, such as Tibet and Burma during the Saffron Revolution.〔 Wired magazine in 2010 called UltraSurf "one of the most important free-speech tools on the Internet" for enabling citizens to access and share information from oppressed countries during times of humanitarian or human rights crises.〔
UltraSurf is funded, in part, through contracts with the U.S. government's Broadcasting Board of Governors, which administers Voice of America and Radio Free Asia.〔Anne Applebaum, (“Why has the State Department run into a firewall on Internet freedom?” ), ''Washington Post'', 4 April 2011.〕 As of 2012, UltraReach has had difficulty serving its growing user base due to insufficient funding.〔("Tools to skirt web censors swamped by demand ), James Ball, ''The Washington Post'' via ''The Independent'', 22 October 2012. Retrieved 24 July 2013.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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