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