3 ms·
The opposite behavior is kind of scary. What prevents someone from faking a "missile echo" response?
by xxpor 7y ago
The opposite behavior is kind of scary. What prevents someone from faking a "missile echo" response?
- paulmd 7y agowikipedia says the transmitter used a pseudorandom sequence, so unless you could copy the PRNG output then you couldn't predict the sequence and generate appropriate returns. Amateurs would just jam the whole frequency so the radar couldn't hear any returns at all.
- Enginerrrd 7y agoSeems like it'd still be susceptible to playback attacks with a slight random delay.
- blattimwind 7y agoYes within d/c. So a priori you already need to be rather very close to the position of the object you want to fake appearing. At that point you might just as well put an object there.
- paulmd 7y agoI don't know what d/c means but if it's data connection then the fact that light (and other EM energy like radio waves) travel faster in air would probably be a problem for using that as a jamming approach
- blattimwind 7y agodistance divided by speed of light = time window for a successful replay attack
- paulmd 7y agoWhile I actually find this discussion interesting (serious), I just want to make the note that this is a military system and thought was undoubtedly applied to making it resistant to at least trivial jamming approaches. Hence the PRNG based timing for the transmission. It would be more compelling if you outlined some ways that that approach might be stymied and how the soviets might have counteracted that.
- oliveshell 7y agoWhat the Hams are doing is radar jamming/interference; it’s not the ability to make the radar screen show whatever you’d like. That would be much, much, much more difficult (if it’s even possible). As far as this sort of spoofing between nation-state actors, discussion is difficult because both the U.S. and Russia have been developing sophisticated ‘electronic countermeasures’ [1] for decades, and all their most interesting capabilities in this regard are certainly classified. [1]: https://en.wikipedia.org/wiki/Electronic_countermeasure https://en.wikipedia.org/wiki/Electronic_countermeasure
- jeherr 7y agoPut a reinforcement learning network on the task to recreate signals from a radar with a ham radio and see if it can learn it. That would be pretty sweet.