4 ms·

"Data Exfiltration from Speakerless Air-Gapped Computers with SSDs via CPU Fan Noise"

sohkamyung 10y ago
The inertia of the fan blades rotating probably limits the data rates you can get with this method, assuming rotation speed correlates with sound frequency (to distinguish between 1 and 0). I would guess it might be a few bits/minute. };-)
- Hydraulix989 10y ago
  And the hysteresis of the cooling policy.
  - teekert 10y ago
    "Data Exfiltration from Speakerless Air-Gapped fanless Computers with SSDs via screen brightness variation." "Data Exfiltration from Speakerless Air-Gapped fanless Computers with SSDs via subtle screen color-temperature variation."
    - ricksplat 10y ago
      I remember reading, in a computer magazine about 15 years ago about a technology, or else an area of research that claimed to do just this. To infer what is being typed on-screen from subtle variations in radiation emitted from the monitors. Apparently some degree of success was possible even outside a building. It probably related more to the CRTs of the day, and the less noisy UIs.
      - shalmanese 10y ago
        Van Eck Phreaking: https://en.wikipedia.org/wiki/Van_Eck_phreaking https://en.wikipedia.org/wiki/Van_Eck_phreaking
      - supacomputa 10y ago
        "It probably related more to the CRTs of the day, and the less noisy UIs." I imagine it's easier with stronger emissions (e.g. CRTs), but also still relevant with EM emitting from modern displays
    - TeMPOraL 10y ago
      "Data Exfiltration from Displayless Speakerless Air-Gapped Fanless Computers with SSDs via Subtle High Frequency Modification of USB Voltages". AKA your mouse wire is your new antenna.
      - williamscales 10y ago
        Ah, nice, that's elegant.
    - throwanem 10y ago
      "Data Exfiltration from Speakerless Air-Gapped fanless Computers with SSDs via Software-Driven Variations in Overall System Power Consumption."
- jschwartzi 10y ago
  You could modulate the data into an analog signal using the range of distinguishable sound frequencies from the fan and probably achieve a useful data rate. Modems do something similar to stream data over a phone line.

The inertia of the fan blades rotating probably limits the data rates you can get with this method, assuming rotation speed correlates with sound frequency (to distinguish between 1 and 0). I would guess it might be a few bits/minute. };-)

Hydraulix989 10y ago
And the hysteresis of the cooling policy.
- teekert 10y ago
  "Data Exfiltration from Speakerless Air-Gapped fanless Computers with SSDs via screen brightness variation." "Data Exfiltration from Speakerless Air-Gapped fanless Computers with SSDs via subtle screen color-temperature variation."
  - ricksplat 10y ago
    I remember reading, in a computer magazine about 15 years ago about a technology, or else an area of research that claimed to do just this. To infer what is being typed on-screen from subtle variations in radiation emitted from the monitors. Apparently some degree of success was possible even outside a building. It probably related more to the CRTs of the day, and the less noisy UIs.
    - shalmanese 10y ago
      Van Eck Phreaking: https://en.wikipedia.org/wiki/Van_Eck_phreaking https://en.wikipedia.org/wiki/Van_Eck_phreaking
    - supacomputa 10y ago
      "It probably related more to the CRTs of the day, and the less noisy UIs." I imagine it's easier with stronger emissions (e.g. CRTs), but also still relevant with EM emitting from modern displays
  - TeMPOraL 10y ago
    "Data Exfiltration from Displayless Speakerless Air-Gapped Fanless Computers with SSDs via Subtle High Frequency Modification of USB Voltages". AKA your mouse wire is your new antenna.
    - williamscales 10y ago
      Ah, nice, that's elegant.
  - throwanem 10y ago
    "Data Exfiltration from Speakerless Air-Gapped fanless Computers with SSDs via Software-Driven Variations in Overall System Power Consumption."
jschwartzi 10y ago
You could modulate the data into an analog signal using the range of distinguishable sound frequencies from the fan and probably achieve a useful data rate. Modems do something similar to stream data over a phone line.