OpenSSH is a free, open source implementation of the SSH (Secure SHell) protocols. It replaces telnet, ftp, rlogin, rsh, and rcp RSA keys as the default.
If you use OpenSSH tools, you are enhancing the security of your machine. All communications using OpenSSH tools, including passwords, are encrypted. Telnet and ftp logging in to your system using one of the intercepted passwords. The OpenSSH set of utilities should be used whenever possible to avoid these security problems.
Another reason to use OpenSSH is that it automatically forwards the DISPLAY variable to the client machine. In other words, if you are running the X Window System on your local machine, and you log in to a remote machine using the ssh command, when you run a program on the remote machine that requires X, it will be displayed on your local machine. This feature is convenient if you prefer graphical system administration tools but do not always have physical access to your server.
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