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« on: June 14, 2018, 2354 UTC »
Watch Crimson Tide...good movie.
The numbers and letters of the actual message have no pattern, that's the whole idea. They are generated from a random character generator.
The character string is coded into a response on the receive side. If the receive side gets an exact match string of characters they execute that pre-programmed response. Like launch your stuff here or there..or it means valid orders to follow, or its just an exercise message.
There are other safeguards beyond just a code match, but I think that is how works high level. I suspect if you crunch the numbers on that code...with the number of alpha and numeric possibilities...that it would be many trillions to one that some unauthorized person could transmit a code that the receive side would respond to falsely....or that we could ever make any sense of it.
Maybe one could speculate that the longer the message string the more sensitive the receive side message...but that would only be speculation.