Psiphon is a free and open-source Internet censorship circumvention tool that uses a combination of secure communication and obfuscation technologies, such as a VPN, SSH, and a Web proxy. Psiphon is a centrally managed and geographically diverse network of thousands of proxy servers, using a performance-oriented, single- and multi-hop routing architecture.[1]
Psiphon is specifically designed to support users in countries considered to be "enemies of the Internet".[2] 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"[3] 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.[4]
Psiphon currently consists of three separate but related open-source software projects:
3.0 – A cloud-based run-time tunneling system.[5]
2.0 – A cloud-based secure proxy system.[6]
1.0 – The original home-based server software (released by the Citizen Lab in 2004, rewritten and launched in 2006). Psiphon 1.X is no longer supported by Psiphon, Inc. or the Citizen Lab.[7]
^Fifield D.; Lan C.; Hynes R.; Wegmann P.; Paxson V. (2015-05-15). "Blocking-resistant communication through domain fronting". Proceedings on Privacy Enhancing Technologies. 2015 (2). Proceedings on Privacy Enhancing Technologies 2015: 46–64. doi:10.1515/popets-2015-0009. S2CID 5626265.
^"Archived copy". Archived from the original on 2012-04-12. Retrieved 2012-04-11.{{cite web}}: CS1 maint: archived copy as title (link)
Psiphon is a free and open-source Internet censorship circumvention tool that uses a combination of secure communication and obfuscation technologies...
and security risks. Examples of tools commonly used include Lantern and Psiphon, which combine a variety of approaches to bypass multiple types of safeguarding...
Psiphon is a censorship circumvention solution that allows users to access blocked web pages in countries where the Internet is censored. Psiphon allows...
original design of the Psiphon censorship circumvention software, which was spun out of the Lab into a private Canadian corporation (Psiphon Inc.) in 2008. In...
the original on June 3, 2008. Retrieved November 20, 2008. "Welcome to Psiphon". Citizen Lab. Archived from the original on December 10, 2008. Retrieved...
was one of the founders and former VP of global policy and outreach for Psiphon. As founder and director of the Citizen Lab, Deibert has overseen and been...
VPN service has been progressively downgraded. Tor Browser is also used. Psiphon is popular. It has also been reported that text messages are being filtered...
does little to circumvent the sophisticated censors. Freegate, Ultrasurf, Psiphon, and Lantern are free programs designed and experienced with circumventing...
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