/etc/wpa_supplicant.conf

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
eapol_version=1
ap_scan=1
fast_reauth=1network={
ssid=”<BSSID>”
key_mgmt=WPA-PSK
proto=WPA
pairwise=TKIP
group=TKIP
psk=”<PASSWORD>”
}/usr/local/sbin/wpa_supplicant -i ath0 -c /etc/wpa_supplicant.conf -D bsd -B

Link: WPA unter Kubuntu