The only REAL way of authentication is biometrics. Anything else can be swapped.
For that matter, if you can replace an amputated finger, how about transplanting a hand? <shrug>
Um. With a password or keycard, its difficult to know if its been stolen--if the keycard drops out of my pocket, I might not notice until I need it again. If my hand gets amputated, I'm fairly certain that I would notice quite quickly... Ben. Ben Samman..............................................samman@cs.yale.edu "If what Proust says is true, that happiness is the absence of fever, then I will never know happiness. For I am possessed by a fever for knowledge, experience, and creation." -Anais Nin Want to give a soon-to-be college grad a job? Mail me for a resume