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I've seen these articles pop up a few times in the past couple days but everyone in aviation already knows that there isn't any security on this stuff. People even jam ATC for giggles sometimes[1]. There's enough redundancy that nothing bad has happened as a result so everyone goes on with life. I think this is just low hanging defcon fruit targeting non aviation-aware readers.
(Replying to PARENT post)
Whenever I hear something like this it reminds me of the favorite talks I attended. The Iridium hacking talk at HOPE XI[1].
"When they talk about security they mainly talk about 'hey this is so complex, no one is able to do this, maybe a state or something like that'. So they say 'it will probably be beyond the reach of all but the most determined attackers.' We went well ok, we are determined."
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But that would reveal your position. Presumably the above could be executed without even being present: just leave behind the equipment.
(Replying to PARENT post)
The glideslope signal (vertical deviation indication) would be easier to spoof. Set that up 1/2 mile short of the runway and aligned to intercept the proper glideslope shortly before the true glideslope intercept point (Maltese cross on the chart). That has a chance of working and going undetected. If you're able to get an aircraft onto the rogue glideslope lobe, even when ATC gets a low altitude alert, the crew is likely to report they're perfectly on glideslope. I'm not sure this is as practical an attack as simply firing on an aircraft on approach, of course.