If you guys want to test it on your machines, you can use the OpenSSH packages from www.openssh.org , which will make public-private RSA key based communication between two boxes over an insecure network.

On latest distribs (Mandrake 8.0+) I'found these nice packages on the first install CD.

Easy to install : sshd package on server side, sshclient on client side, a bit of rsakeygen to gen the keys et hop c'est parti.

Benefits are for example secure telnet.

-hantiz.