alt Hacker NewsSo these messages are presumably encrypted with a one time pad, and some lookup book of what each message of just a few characters means?
And I assume there are also a high bandwidth comms channels, and this is just the backup which is presumably tested each day.
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I think this is the primary.
High bandwidth comms are likely a lot more fragile than this. At the same time: there will be many different transmission channels, and I would expect this one to be useless immediately if someone really did something nasty.
You can probably just point Claude or ChatGPT to decrypt it, it would find that there's some silly and obvious cipher is used that survived from the 60ies, with a 56 bit private key. /this is a wild guess, I don't have any special clearance or access/
Some of the comms channels are even lower bandwidth: https://en.wikipedia.org/wiki/Extremely_low_frequency (Though, apparently the US no longer uses this)