If there is an existing directory for the signature key, the signature key generator 123 simply stores {HEAD ~ the e mail} in {TAIL ~ that directory} in step 206 
If there is an existing directory for the signature key , the signature key generator 123 simply stores { HEAD ~ the e mail } in { TAIL ~ that directory } in step 206
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH