From: Jim choate <ravage@bga.com>
Date: Fri, 10 Jun 94 14:42:58 PDT
To: jim@rand.org
Subject: Re: Delayed self-encrypting messages
In-Reply-To: <9406102032.AA14793@mycroft.rand.org>
Message-ID: <199406102142.QAA06951@zoom.bga.com>
MIME-Version: 1.0
Content-Type: text


> 
> 
> > Paul Schauble <pls@crl.com> writes:
> > Can I do this with crypto technology? Can I send someone a message, and 
> > possible a program, such that the message can only be decrypted after a 
> > predetermined date?
> 
> I think you would need a trusted time server that sends out signed
> timestamps... you can't trust other time sources, including WWV (just
> broadcast a signal locally to swamp the signal).
> 
Use the GPS systems. They are synced to the NITS (or whatever they call it 
now) and have time stamps coded in them. As to swamping out a sat or two,
yeah could be done but they would have to be mighty high above you in
a airplane or blimp or something...