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Are we that surprised? I remember being blown away to read that a program could modulate a CPU to play music over an FM radio -- though whenever I google I'm n
by logicallee 11y ago
Are we that surprised? I remember being blown away to read that a program could modulate a CPU to play music over an FM radio -- though whenever I google I'm not able to find that reference.
But are we that surprised that a cell phone has software-defined radio, or is extremely sensitive in the gigahertz frequency range? Or that a hacked baseband can listen to the cues from a memory bus in that range, and isolate some predefined pattern that is extremely distinguishable? Or that a memory bus can emit noise at those frequencies? Or that this can be controlled via software?
I mean, this isn't - "this web site can send a text message from any airgapped computer without a sim card, by modulating its CPU to broadcast to all cell phone towers. Using pure CSS."
If that were in javascript, if it didn't require a hacked or modified anything - now that is the realm of science fiction :)
- revelation 11y agoWell, of course none of these things are all particularly noteworthy in isolation. But it takes someone to put them all together into a working PoC. On the Javascript part, they might very well be able to port this. Since any modern browser now JITs Javascript, it just becomes a matter of sculpting the JS to get the desired native code from the JIT.
- logicallee 11y agoI would be extremely impressed with a javascript solution. The reader part of it boils down to: "Hacked baseband can discern two special PC memory access patterns from each other" - which, if you're willing to transmit for long enough, is all it takes to exfiltrate.
- 0x0 11y agoI've never heard of modulating a CPU to play FM radio, but I've heard of using VGA/CRT patterns to modulate music on FM radio. Which is still impressive, but at least a little less surprising what with the cables and mechanical cathode rays and stuff being large, external items..?
- LukeShu 11y agoI think OP is thinking of using an Altair 8800 to play music on an AM radio.
- logicallee 11y agoLikely! Thanks. But I can't find a reference for that either :)
- 0x0 11y agohttps://www.youtube.com/watch?v=fgYhVnmeWrk https://www.youtube.com/watch?v=fgYhVnmeWrk and http://www.digibarn.com/collections/movies/digibarn-tv/erik-klein-altair-8800-playing/ http://www.digibarn.com/collections/movies/digibarn-tv/erik-... probably? :)
- pingec 11y agoSomething similar http://www.erikyyy.de/tempest/ http://www.erikyyy.de/tempest/
- brohee 11y agoWhich inspired http://bellard.org/dvbt/ http://bellard.org/dvbt/, far more impressive.