Pentest Tools kbd-audio_1

Published on December 1st, 2018 📆 | 5356 Views ⚑


Kbd-Audio – Tools For Capturing And Analysing Keyboard Input Paired With Microphone Capture

This is a collection of command-line and GUI tools for capturing and analyzing audio data. The most interesting tool is called keytap– it can guess pressed keyboard keys only by analyzing the audio captured from the computer’s microphone.


Build instructions

  • SDL2 – used to capture audio and to open GUI windows libsdl
  • FFTW3 – some of the helper tools perform Fourier transformations fftw

Linux and Mac OS

git clone
cd kbd-audio
git submodule update --init
mkdir build && cd build
cmake ..


(todo, PRs welcome)


Record audio to a raw binary file on disk
Usage: ./record-full output.kbd

Playback a recording captured via the record-full tool
Usage: ./play-full input.kbd

Record audio only while typing. Useful for collecting training data for keytap
Usage: ./record output.kbd

Playback a recording created via the record tool
Usage: ./play input.kbd


Detect pressed keys via microphone audio capture in real-time. Uses training data captured via the record tool.
Usage: ./keytap-gui input0.kbd [input1.kbd] [input2.kbd] …
Live demo (WebAssembly threads required)

keytap2 (work in progress)
Detect pressed keys via microphone audio capture. Uses statistical information (n-gram frequencies) about the language. No training data is required. The ‘recording.kbd’ input file has to be generated via the record-full tool and contains the audio data that will be analyzed. The ‘n-gram.txt’ file has to contain n-gram probabilities for the corresponding language.
Usage: ./keytap2-gui recording.kbd n-gram.txt

Any feedback about the performance of the tools is highly appreciated. Please drop a comment here.

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