Consider 99% of all US secrets are withheld from the public, but most of them are known to foreign entities through open sources like trade journals and logistic reports by railroads and other obscure places. What is not found there, is found through spy trade craft.
Only the US public is in the dark.
“Only the US public is in the dark.”
Mainly because the American public are — to a great extent — too lazy or too disinterested to read between the lines, which is at least 80% of intelligence gathering.