-----BEGIN PGP SIGNED MESSAGE----- In article <199511111953.MAA26503@nagina.cs.colorado.edu>, Bryce <wilcoxb@nagina.cs.colorado.edu> wrote:
A single station could serve up multiple pieces. It would only reveal the k piece if the querying agent can prove that he has the k-1 piece. Of course if the total number of stations is small then the "physically move the pieces" trick might work.
But you're back to trusting an agent or device not to reveal a secret. What have you gained? The point about moving the elements of the message physically apart has merit, though. So the one-time pad of timerel, the ideally secure but unworkable model, is to encrypt your message with an OTP, then securely transport the pad and location to points that are $ct$ metres apart, where $t$ is the length of time you want to keep your message secret. You could do this with a reflector $ct/2$ metres away, assuming your opponent and you are in the same location. I suppose this could be useful for very short-term applications (for reference, the diameter of the solar system is about 5.4 light-hours), but like the OTP, its application is limited. -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBMKVYPeyjYMb1RsVfAQFvnAP9H7KfW6pDxvHJF2lIucJyuHX8W2Adrxbd X5rawyQctlAWwRcef6JIPxHcUuL6uznW7bMXrDQMIzDjQMQ/Rb9SdxKdncU0sNQ3 kEuoCKI0r7FJtRS5fSByB6TyQ9dCJJGVRed7P9KVzjP6bCk7Ri889SfNLBd583Kp INOMxDJ0sDY= =LtqD -----END PGP SIGNATURE----- -- Shields.