Ultrasurf is a freeware Internet censorship circumvention product created by Ultrareach Internet Corporation. The software enables its users to bypass censorship and firewalls using an HTTP proxy, 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 magazine, 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; Ultrasurf says their security considerations mean they prefer third party expert review to open source review.
How to Install and Uninstall-
NO NEED TO INSTALL. JUST CLICK ON EXE FILE AND U R DONE.
Ultrasurf is free to download, and requires the installation of a local u.exe file. Ultrasurf does not install any additional files on the user's computer, and leaves no registry after it exits. To uninstall the software, a user needs only to delete the u.exe file. It is only available on a Windows platform, and runs through Internet Explorer by default, with an optional plug-in for Firefox.
The Ultrareach website notes that "Some anti-virus software companies misclassify Ultrasurf as a malware or Trojan because Ultrasurf encrypts the communications and circumvents internet censorship." Some security companies have agreed to whitelist Ultrasurf. According to Applebaum, the Ultrasurf client uses anti-debugging techniques and also employs executable compression. The client acts as a local proxy which communicates with the Ultrareach network through what appears to be an obfuscated form of TLS/SSL.