Netctl has a feature called wifi-menu that we’ll use, but this program depends on another one not installed by default: dialog.

# pacman -S dialog

Once it’s done, run :

# wifi-menu -o wlan0

Of course, change wlan0 by the name of the interface set up on your system.
The command allows wifi-menu to build a network profile for your Wifi, and will hash the pass-phrase with the option -o.
Answers the questions asked by the big blue screen, and if everything is good, you should take back your prompt.

Now run :

# netctl enable PROFILENAME

Here PROFILENAME is built by default as ${INTERFACE_NAME}-${WIFI_SSID}.
I let you make the changes, and press ‘Enter’.

Now you can reboot as many times as you want, your Pi is supposed to connect itself at startup, to the Wifi.

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Actually it’s not entirely finished, ‘cause the official documentation advises us to change the permissions on profiles containing secrets : # chmod 0600 /etc/netctl/PROFILENAME