In the early days of espionage, long before the advent of burner phones, satcoms, and other modern-day spy gadgets, getting word to field agents—especially those working behind the Iron Curtain—proved a dangerous game with global consequences should the agent's cover be blown. But that's where number stations, and their uncrackable radio codes, come in.
from Gizmodo http://ift.tt/1G2EjV2
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