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Jun 4, 2018 at 1:13 comment added Christopher King Just copy the bitcoin mining algorithm. Write it on the wall. You can only really do it if you have a digital computer.
Jun 2, 2018 at 15:49 history edited Brythan CC BY-SA 4.0
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Jun 1, 2018 at 0:39 comment added Andon For part 3, while robots and the like might not be good, with batteries and electronics not lasting long even when stored properly, a purely mechanical computer can exist. Take a look at the Mark 1 Fire Control Computer from WWII - Purely mechanical, and instructions can be left as to its assembly, operation and function. Such a machine could be designed that could then manufacture significantly more complex things if given the appropriate starting materials. There's limits, of course, but the knowledge on the walls is more valuable anyway.
May 31, 2018 at 22:57 vote accept DannyDeVitamins
May 31, 2018 at 22:09 comment added Cadence @Josh I was interpreting "modern knowledge" to be more along the lines of "modern scientific knowledge", hence the idea of using a code that would be difficult if not impossible to break by hand, but trivial with more computational power.
May 31, 2018 at 21:58 comment added Josh I think the OP may mean that the encryption should be easily breakable by anyone with modern knowledge. If that's the case, the method of using the key to decrypt the information can be written in plain english (or whichever language is common in the area) and the instructions can include hints to the key, like a puzzle in the newspaper. The answers to the clues should rely on common (modern) knowledge, like the molecular makeup of water (H20) or the names of major countries based on their flags (USA, Russia, China, Japan, etc)
May 31, 2018 at 21:24 history answered Cadence CC BY-SA 4.0