Airlink AP431W - Manual (Page 8)

Step 4c WPA-PSK and WPA-2PSK are more secured than WEP and highly recommended. Select
WPA-PSK or WPA2-PSK from the drop-down menu and enter the key value in the PassPhrase. Click
Apply.
WPA-PSK (WiFi Protected Access-Pre Shared Key)
You can refer to the User Manual in the provided CD for other authentication types.