In some embodiments, the SAPK may be stored at the reader, and {HEAD ~ the reader} may access {TAIL ~ the stored SAPK} instead of having to retrieve it from the signing authority 
In some embodiments , the SAPK may be stored at the reader , and { HEAD ~ the reader } may access { TAIL ~ the stored SAPK } instead of having to retrieve it from the signing authority
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH