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I first learned about this from Tim Powers book DECLARE. He is a great scifi/fantasy writer, and a lot of the beginning of the book is about a young spy recruited fom England to work with a Russian lady in France during WW2. He and she receive and translate the messages using one-time pads, and it mentions the trouble of bouncing a signal off the atmosphere to get it to travel so far. Tim Powers writes great fantasy based off of real events.
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