What does HackerNews think of system-bus-radio?

Transmits AM radio on computers without radio transmitting hardware.

Language: C

#11 in Security
Improved audio rendering with an optimised version of memcpy (2013) | Mar 2023
Expand Context ↕
Modern CPUs can produce an AM radio signal too https://github.com/fulldecent/system-bus-radio
How is portable AM radio possible? | Mar 2022
Expand Context ↕
Absolutely: "System Bus Radio"

https://github.com/fulldecent/system-bus-radio
Make an internet radio station with one line of bash | Jan 2022
If the network is down...Carry on. The music can't stop.

"System Bus Radio" https://github.com/fulldecent/system-bus-radio

Jumping the Air Gap: 15 Years of Nation-State Effort [pdf] | Dec 2021
Expand Context ↕
Probably because to get this stuff to work is really hard in practice.

Several years ago, we were playing with https://github.com/fulldecent/system-bus-radio to work, but we couldn't, even though we had the right MacBooks.
How we protect our most sensitive secrets from the most determined attackers | Nov 2021
Expand Context ↕
Have you gone fully paranoid and your air-gaped system is in a Faraday cage inside an anechoic chamber? Things like bus radio [1], coil whine and power fluctuations can be used (it has been shown) to exfiltrate data.

[1] https://github.com/fulldecent/system-bus-radio
Computers should expose their internal workings as a 6th sense | Aug 2021
Expand Context ↕
It's https://fulldecent.github.io/system-bus-radio/ (https://github.com/fulldecent/system-bus-radio)
Finding Radio Frequency Side Channels | Apr 2020
Expand Context ↕
Oona Räisänen has an awesome video of van eck phreaking against HDMI: https://www.youtube.com/watch?v=BpNP9b3aIfY

Also I think this paper is amazing - http://s3.eurecom.fr/docs/ccs18_camurati_preprint.pdf

"The well-known electromagnetic (EM) leakage from digital logic is inadvertently mixed with the radio carrier, which is amplified and then transmitted by the antenna. We call the resulting leak “screaming channels”"

You might find this interesting too, leaking AM emissions from a computer by twiddling the memory bus - https://github.com/fulldecent/system-bus-radio

I made a silly program to play .wav files based on that.
Serial Port SDR | Dec 2018
USB serial dongle? pah, use the system-bus on the motherboard ;) https://github.com/fulldecent/system-bus-radio
Shouting in the Datacenter (2008) [video] | Jun 2018
Expand Context ↕
There's also https://github.com/fulldecent/system-bus-radio Sidechannels everywhere!
Quiet for Android – TCP over sound | Feb 2018
Today I learned that you can actually abuse the system bus on some macbooks to actually send audio over AM radio[0]. Even scarier, you can do it from the browser[1]. And now this library[2] will let you open a TCP connection over the radio to download off that data machine. This is shaping up to be a pretty cool attack PoC!

[0]: https://github.com/fulldecent/system-bus-radio

[1]: https://fulldecent.github.io/system-bus-radio

[2]: https://github.com/quiet/quiet-js

The ReMarkable E Ink Tablet | Feb 2018
Expand Context ↕
https://github.com/fulldecent/system-bus-radio
Qubes OS: A reasonably secure operating system | Nov 2017
Expand Context ↕
Or how about the AM radio transmitter that is built into all x86 hardware - https://github.com/fulldecent/system-bus-radio
Show HN: Libquiet – transmit data using sound | Mar 2016
Couple this with a System Bus AM Radio [1] for super fun times

[1]: https://github.com/fulldecent/system-bus-radio

Show HN: Playing a .wav file through the system bus | Mar 2016
Based on the awesome work at https://github.com/fulldecent/system-bus-radio

I use PDM to output a .wav file via the system bus, and pick up via a radio.