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Re: Who needs time vaults anyway?
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In article <[email protected]>,
Bryce <[email protected]> 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.
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