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How can a time traveler encrypt info so it's only decryptable after a given date
I have a time traveler basically dropping a few computers with a sort of technological uplift program into the 1980s. These computers have information about future science & technology, along ...
Since the butterfly effect is in full force I imagine they would most likely use something like astrological observations and measurements, things that happened long ago and thus can't really be changed by recent human technological development, for generating this key. $\endgroup$$\begingroup$In Flann O'Brian's 'The Dalkey Archive', the eccentric genius de Selby reveals a plot to simultaneously make the air lifeless throughout the Earth using some substance he called DMP. There is also the method outlined in Robert L. Forward's Draggon's Egg, where the decryption bits come from the immediately preceding discovery -e.g. you find the next piece of quantum gravity theory if you measure some fundamental constant up to X digits (meaning you must have advanced accelerators first).
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