WiFi QR Code Security: Password Exposure, Evil Twins, and Guest Networks

1. Password Is in Plain Text

The payload holds the SSID and key as readable text. Anyone who scans can view it and can also photograph the code.

2. Reduce Exposure

* Use a separate guest network isolated from internal devices and cash registers. * Rotate the key periodically and reprint. * Use client isolation so guests cannot see each other. * Do not use the same key for staff networks.

3. Evil Twin Risk

An attacker can broadcast a network with the same name. Using WPA2 or WPA3 with a strong key and checking the network list helps, though a QR alone does not prove authenticity.

4. Public Venues

Place the code where staff can see it so overlays are noticed.