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Relay-based Internet censorship circumventer


Psiphon Circumvention System is an open source relay-based Internet censorship circumventer.

The system consists of a client application, which configures a users computer to direct Internet traffic; and a set of servers, which proxy client traffic to the Internet. As long as a client can connect to a Psiphon server, it can access Internet services that may be blocked to the user via direct connection.

Design goals

  • The Internet is not World Wide if someone somewhere is denied access.
  • The right to freedom of opinion and expression affects us all, even if censorship does not.

Security note

To accomplish its design goals, Psiphon uses computer security technology including encryption and digital signatures. Using these algorithms does not mean Psiphon 3 offers additional security properties such as privacy or authentication of destination sites for users’ Internet traffic. [ref]

For additional information about how Psiphon works, please see the FAQ.

Cloud service client

Psiphon is a program that uses various tunnelling technologies to securely connect to a cloud service. Please be aware that this program is anti-censorship and does not guarantee privacy. To determine what information is collected by your usage of the service and how it may be used, please see the privacy policy.


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