Yes if some one opened the outside box and somehow manipulated the rfid reader and figured out which pin was the rx and then some how hooked up to that and then spoof a valid RFID tag that I have in the system...they could gain entry... I suppose...
Yeah that was where my idea failed.
You would need a code of an RFID tag. You couldn't just bombard it with random data and it would open..
Sounds pretty secure then 
Mowcius