Audio Diode - with Speaker/Headphone Control

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

 

System Diagram

Audio Diode models addressed in this page:

  • FA10A-4 - Audio Diode Analog to Analog without microphone support
  • FA10B-4 - Audio Diode USB to Analog without microphone support

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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.

Push-Button Control

  • Has push button to activate the speaker/headphone.
  • Can be configured (for example, to set how long the speaker remains open when conducting a Skype call). If needed, can be extended by re-pressing at end of the set period, to continue the conversation.
  • Uses a bi-color (green and red) LED to show ON/OFF status. The LED also flickers before disconnection.
  • Detects a press-and-release as a single event, to prevent pressing and holding the button nonstop.
  • When pressing the speaker button, if no sound is heard for 20 seconds, it disconnects automatically.

 

Prevents hackers from taking advantage of audio-data leakage

The diode blocks listening in to surrounding conversations, by forcing unidirectional flow. It uses a low-pass filter to block high-frequency signal attacks. It has push button to switch off access while users are away.

Small size

The 85mm X 65mm X 34mm unit takes up almost no room on your desktop.

Easy to install and operate

Quickly connects to the host PC and audio device. Users only need to click on the push button to run it.

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.

Push-Button Control

  • Has push button to activate the speaker/headphone.

  • Can be configured (for example, to set how long the speaker remains open when conducting a Skype call). If needed, can be extended by re-pressing at end of the set period, to continue the conversation.

  • Uses a bi-color (green and red) LED to show ON/OFF status. The LED also flickers before disconnection.

  • Detects a press-and-release as a single event, to prevent pressing and holding the button nonstop.

  • When pressing the speaker button, if no sound is heard for 20 seconds, it disconnects automatically.

Audio Diode without microphone support

Model Number

FA10A-4 FA10B-4

Input Interface (Host)

Analog

USB 

Output Interface (Audio Device)

Analog

Analog 

Power (via USB)

5v@0.5A

Environmental

 

  • Temperature range: Operating - 0ºC to 40ºC (32ºF to 104ºF); Storage -20ºC to 60ºC (-4ºF to 140ºF)
  • Humidity: Operating - 20 to 80% non-condensing; Storage – 10 to 90% non-condensing
  • Altitude: 0 to 10,000 ft
 

Physical Characteristics

  • Dimensions: 85 (W) x 65 (D) x 34 (H) mm,
    3.1 (W) x 3.1 (D) x 2.4 (H) inch
  • Device weight: 185 gr (0.41 lbs.)
 
Model Description CPN
FA10A-4 Audio Diode Analog to Analog without microphone support CPN17328
FA10B-4 Audio Diode USB to Analog without microphone support CPN17327
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