WPA without NetworkManager or alike
$ sudo chmod 0600 /etc/network/interfaces $ sudo wpa_passphrase myssid my_very_secret_passphrase
The output will be similar to this:
network={
ssid="myssid"
#psk="my_very_secret_passphrase"
psk=ccb290fd4fe6b22935cbae31449e050edd02ad44627b16ce0151668f5f53c01b
}
Configure /etc/network/interfaces:
iface wlan0 inet dhcp
wpa-ssid myssid
wpa-psk ccb290fd4fe6b22935cbae31449e050edd02ad44627b16ce0151668f5f53c01b