On Sun, 5 Mar 2000 [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?
If you're referring to the second conjecture of mine, that is essentially
what it states, but it's an extremely speculative notion, with little
chance of any techniques for doing it being discovered in the near future,
and any such techniques would be very slow at best.
The PKC I came up with is just a classical public key technique - it
doesn't enable any fundamentally new protocols.
-Bram Cohen
