When we use the WPS button that's to do what we call "pairing" or connecting to the router.

Also, if the router is not setup for say WPA2 which is the latest out today for all, then you would NOT fix this with the USB WiFi 5GHz adapter. The WPA2 is a router setting and NOT done at the adapter.

The answer is NO. You will not be able to "encrypt this device" until you change the router settings to say WPA2.