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Castov
LABS

Sonic-Gap Bridge

Transfer data between air-gapped devices using inaudible high-frequency acoustic sound waves and your device microphone.

Air-Gapped Audio Bridge

Sonic-Gap Bridge

Ultrasonic acoustic data transfer protocol (FSK 18kHz - 19kHz)

READY / IDLE
Transmitter (Tx)Speaker Output
Receiver (Rx)Microphone FFT
// AWAITING SONIC SIGNAL
Real-Time FFT Spectrogram
Acoustic spectrum 16kHz - 20kHz

Acoustic Air-Gap Transfer

Sonic-Gap modulates binary data into near-ultrasonic sound frequencies (18kHz-19kHz) for physical air-gapped data transfer.

How to use this tool

  1. Set device A to Transmit mode.
  2. Set device B to Receive mode with microphone access enabled.
  3. Send payload and receive real-time decoded binary data.

Examples

Frequently Asked Questions

Does this require internet access?
No, transmission happens strictly through acoustic audio waves between the speaker of one device and microphone of another.