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Created Dec 30, 2019
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Encoding your WiFi access point password into a QR code

Encoding your WiFi access point password into a QR code

Up until recently, it was a pain to defend againt WPA2 brute-force attacks by using a random 63-character password (the maximum in WPA-Personal) mode). Thanks to Android and now iOS 11 supporting reading WiFi passwords from a QR code, this is finally a practical defense.

Generating the QR code

After installing the qrencode package, run the following:

qrencode -o wifi.png "WIFI:T:WPA;S:<SSID>;P:<PASSWORD>;;"

substituting <SSID> for the name of your WiFi network and <PASSWORD> for the 63-character password you hopefully generated with pwgen -s 63.

The only pitfall I ran into is that if you include a trailing newline character (for example piping echo "..." into qrencode as opposed to echo -n "...") then it will fail on both iOS and Android.

Scanning the QR code

On iOS, simply open the camera app and scan the QR code to bring up a notification which allows you to connect to the WiFi network:

On Android, go into the WiFi settings and tap on the WiFi network you want to join:

then click the QR icon in the password field and scan the code:

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