Also reminds me of this Kerberos one: http://web.mit.edu/kerberos/dialogue.html http://web.mit.edu/kerberos/dialogue.html (Edit: someone else already posted th

Also reminds me of this Kerberos one: http://web.mit.edu/kerberos/dialogue.html http://web.mit.edu/kerberos/dialogue.html (Edit: someone else already posted that further down - doh)