{HEAD ~ A cryptographic unit} generates/stores an asymmetric cryptographic public/private key pair associated with {TAIL ~ each authorized BCU user} 
{ HEAD ~ A cryptographic unit } generates / stores an asymmetric cryptographic public / private key pair associated with { TAIL ~ each authorized BCU user }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL