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https://en.wikipedia.org/wiki/SIGSALY#Operation if anyone just wants to get a feeling for how it worked. Pretty good writeup IMO.

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OP here, yes, good write up, although I wish someone would code up a simulation that showed it and allowed us to hear what this telephone sounded like to FDR and Churchill.

Supposedly like this: https://www.youtube.com/watch?v=OvR4qK0B--w&t=517s

(I see now that it was already linked elsewhere in the the thread.)

Pretty impressive for cross atlantic one-time pad voice comms in an analogue era, I think. It's amazing what money and smart people can accomplish.

Also found this fantastic page: https://www.cryptomuseum.com/crypto/usa/sigsaly/

Oh, wow, that's a great page with a lot more technical detail than what I originally posted ^^ highly recommended.

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