In one embodiment {HEAD ~ the BCU} 103 may associate {TAIL ~ one unique “active” key pair Kpv/Kpb} with an authorized user 101 of the PID 100, which key pair Kpv/Kpb may be updated by the BCU 103 from time to time, thereby replacing the previous key pair 
associate
In one embodiment { HEAD ~ the BCU } 103 may associate { TAIL ~ one unique “ active ” key pair Kpv / Kpb } with an authorized user 101 of the PID 100 , which key pair Kpv / Kpb may be updated by the BCU 103 from time to time , thereby replacing the previous key pair
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH