Audio Diode – with Speaker/Headphone Control

High Sec Lab’s Audio Diode mitigates the risks of eavesdropping when using peripheral audio devices by forcing unidirectional audio flow.

The Threat of Using Audio Peripherals
Attackers can take control of an audio device to:

  • Listen in to classified or sensitive conversations in secure rooms.
  • Transfer data from secure to unsecured networks

The new HSL Audio Diode family of products connects between a source (a PC usually) and an audio device (speaker/ headphone). The Audio Diode prevents attackers from exploiting audio-data leakage.

Unidirectional Flow
The Audio Diode functions as a diode that forces audio signals from a PC to be unidirectional. This prevents hackers from manipulating a speaker/headphone to function as a microphone, for picking up surrounding conversations.

Low-Pass Filter
All sounds passing through the Audio Diode go through a low-pass filter that restricts the audio frequencies to the range compatible with the human ear. This prevents hackers from attacking by broadcasting high-frequency signals to an external hacking device.

Compliant with NIAP Common Criteria PP4.0 PSD Protection Profile



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