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KRACK Detector
KRACK Detector is a Python script to detect possible KRACK attacks against client devices on your network. The script is meant to be run on the Access Point rather than the client devices. It listens on the Wi-Fi interface and waits for duplicate message 3 of the 4-way handshake. It then disconnects the suspected device, preventing it from sending any further sensitive data to the Access Point.
KRACK Detector currently supports Linux Access Points with hostapd. It uses Python 2 for compatibility with older operating systems. No external Python packages are required.
Usage
Run as root and pass the Wi-Fi interface as a single argument. It is important to use the actual Wi-Fi interface and not any bridge interface it connects to.
python krack_detect.py wlan0
If you do not wish to disconnect suspected devices, use the -n flag
python krack_detect.py -n wlan0
Known Issues
Message 3 of the 4-way handshake might be retransmitted even if no attack is perfomed. In such a case the client device will be disconnected from the Wi-Fi network. Some client devices will take some time to re-authenticate themselves, losing the Wi-Fi connection for a few seconds.
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