{HEAD ~ A digital signature} is preferably used for the cryptographic protection, thereby digitally notarizing {TAIL ~ the encoded text stream} 
{ HEAD ~ A digital signature } is preferably used for the cryptographic protection , thereby digitally notarizing { TAIL ~ the encoded text stream }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL