QR Password — Air-Gapped Credential Bridge

Bidirectional credential transfer using QR codes as an optical channel. No secret touches a network.

Security Rules (MANDATORY)

• Never log credentials to chat history or memory files
• Redact passwords from all conversation output — show ** instead
• Auto-clear canvas display after 30 seconds using timed canvas hide
• QR images are ephemeral — delete after use with rm
• Never store decoded credentials in any file

Mode A: Vault → QR (Outbound)

Generate a QR code from a credential for an air-gapped device to scan.

echo '{"username":"USER","password":"PASS","domain":"DOMAIN"}' | \
  python3 skills/qr-password/scripts/generate-qr.py /tmp/qr-out.png

Then display via canvas and auto-clear:

canvas present /tmp/qr-out.png
# Wait 30s
canvas hide
rm /tmp/qr-out.png

When reporting to user, say "QR displayed" — never echo the password.

Mode B: Camera → Credential (Inbound)

Read a QR code from a camera image to extract credentials.

1. Capture image: nodes camera_snap (or accept user-provided image)
2. Decode:

python3 skills/qr-password/scripts/read-qr.py /path/to/image.png

1. Output is JSON: {"username":"...","password":"...","domain":"..."}
2. Use the credential (fill, copy, deliver) — never echo password to chat
3. Delete the image: rm /path/to/image.png

Offline QR Generator

For air-gapped devices, provide assets/qr-generator.html — a standalone offline HTML page that generates QR codes locally in-browser. No network required.

Dependencies

Python 3 with: qrcode, Pillow, opencv-python-headless

Install: python3 -m pip install --user qrcode Pillow opencv-python-headless