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Psiphon

Psiphon
Psiphon-84.png
Developer(s) Psiphon, Inc., the Citizen Lab
Initial release 2004 (1.0), 1.6 (2008) 2009 (2.X), 2011 (3.x)
Stable release(s)
Psiphon 3.X for Windows, Psiphon 147 for Android, Psiphon Pro 147 for Android / 18 December 2016; 4 months ago (2016-12-18) (Psiphon for Windows), 18 January 2017; 3 months ago (2017-01-18) (Psiphon for Android), 17 January 2017; 3 months ago (2017-01-17) (Psiphon Pro for Android)
Repository bitbucket.org/psiphon/psiphon-circumvention-system
Development status Active
Operating system Windows, Android
Size Psiphon 4.7 MB on Windows, Psiphon 7.9 MB on Android, Psiphon Pro 8.4 MB on Android
Type Internet censorship circumvention
License GNU General Public License
Website psiphon.ca

Psiphon is an open-source Internet censorship circumvention tool that uses a combination of secure communication and obfuscation technologies (VPN, SSH, and HTTP Proxy). Psiphon is a centrally managed, geographically diverse network of thousands of proxy servers, using a performance-oriented, single hop architecture.

Psiphon is specifically designed to support users in countries considered to be "enemies of the Internet". The codebase is developed and maintained by Psiphon, Inc. which operates systems and technologies designed to assist Internet users to securely bypass the content-filtering systems used by governments to impose censorship of the Internet.

The original concept for Psiphon (1.0) was developed by the Citizen Lab at the University of Toronto, building upon previous generations of web proxy software systems, such as the "Safe Web" and "Anonymizer" systems.

In 2007 Psiphon, Inc. was established as an independent Ontario corporation that develops advanced censorship circumvention systems and technologies. Psiphon, Inc. and the Citizen Lab at the Munk School of Global Affairs, University of Toronto occasionally collaborate on research projects, through the Psi-Lab partnership.

Psiphon currently consists of three separate but related open source software projects:

The original concept for Psiphon envisioned an easy-to-use and lightweight Internet proxy, designed to be installed and operated by individual computer users who would then host private connections for friends and family in countries where the Internet is censored. According to Nart Villeneuve "The idea is to get (users) to install this on their computer, and then deliver the location of that circumventor, to people in filtered countries by the means they know to be the most secure. What we're trying to build is a network of trust among people who know each other, rather than a large tech network that people can just tap into." Psiphon 1.0 was launched by the Citizen Lab on 1 December 2006 as open source software.


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