A biometric and cryptographic processing unit includes a biometric receiver receiving {HEAD ~ biometric information} of {TAIL ~ a BCU user} 
A biometric and cryptographic processing unit includes a biometric receiver receiving { HEAD ~ biometric information } of { TAIL ~ a BCU user }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL