SSH

SSH (Secure SHell) is an encrypted terminal program that replaces the classic telnet tool on Unix-like operating systems.

In addition to remote terminal access provided by the main ssh binary, the SSH suite of programs has grown to include other tools such as scp (in very common use) and sftp (less common).

Originally, SSH was not free. However, today the most popular and de-facto standard version of SSH is OpenBSD's OpenSSH, which comes pre-installed on Gentoo.