The host key fingerprint is a long sequence of letters and numbers (hexadecimal) like 57:ff:c9:60:10:17:67:bc:5c:00:85:37:20:95:36:dd that securely identifies a particular server. The first time you connect to a server, you should be prompted to confirm the host key fingerprint for that server. Important: you should now verify the host key and configure your applications, otherwise you are not using the tunnel you have created. A connection is established to the server, and a new window opens, prompting you for your username and password.Įnter this information and you will be logged into the server and receive a command line prompt from the server. Next, in the Category list, select Connection > SSH > Tunnels.Įnter 1080 for the Source port, and check the Dynamic and IPv4 boxes. If you will perform these steps frequently, you can create a PuTTY profile that saves these options as well as the options described below so they will be used every time. If you only know the IP address or if DNS blocking is preventing you from using the host name, you can use the IP address instead. First enter the host name (address) of the SSH server you are going to connect to (here, ). When you start PuTTY, a session configuration dialog appears. You can save the putty.exe program on your hard drive for future use, or run it directly from the Web site (often, this is possible on a shared or public-access computer, such as a computer in a library or Internet café). Important: you should now verify the host key and configure your applications, otherwise you are not using the tunnel you have created! Windows graphical user interface (with PuTTY) With the use of the -D option, a local SOCKS proxy will be created and will exist as long as you're connected to the server. You'll be prompted for your password and then you'll be logged into the server. The ssh command you'll run contains a local port number (typically 1080), a server name, and a username (account name). OpenSSH is available from, but it comes pre-installed on Linux/Unix and Mac OS computers. Linux/Unix and MacOS command line (with OpenSSH) The steps below will set up a SOCKS proxy on local port 1080 of your computer. In this example, we will describe only this use of SSH. For Windows, you can also get a free SSH implementation called PuTTY.Īll recent versions of SSH support creating a SOCKS proxy that allows a Web browser and a wide variety of other software to use the encrypted SSH connection to communicate with the unfiltered Internet. which sell accounts for about 2-10 US dollars a month.Īn SSH program called OpenSSH is already installed on most Unix, Linux, and Mac OS computers as a command-line program run from a terminal as "ssh". There is a list of shell account providers at: Some companies also sell accounts on their servers, and many Web hosting plans provide SSH access. For censorship circumvention, this server needs to have unrestricted Internet access and, ideally, is operated by a trusted contact. Using SSH requires an account on a server machine, generally a Unix or Linux server. Censors may be reluctant to block SSH entirely because it is used for many purposes other than circumventing censorship for example, it is used by system administrators to administer their servers over the Internet. SSH is especially useful for censorship circumvention because it can provide encrypted tunnels and work as a generic proxy client. SSH can be used for a wide variety of secure communications applications, where secure log-in to a server and secure file transfers (scp or SFTP) are the most common. The encryption prevents these communications from being viewed or modified by network operators. SSH, the Secure Shell, is a standard protocol that encrypts communications between your computer and a server.
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