At 09:53 PM 3/5/00 -0500, [EMAIL PROTECTED] wrote:
>
>Perhaps this solves a little problem we've been playing with:
>
>We have an untrusted user that needs a key to unlock a file for
>processing. Is there anyway we can transmit a key to the program that
>processes the file and allow the program to unlock the file for
>processing such that the key cannot be determined by the user and thus be
>prevented from unlocking the file on his own?
>
>Jeff
A tamper-resistant dongle running an authentication protocol.
You supply the dongle, he gives it back when done, and
can't read the key out of it. They key is never revealed
on the output port; the authentication protocol handles that.
