In todays systems, {HEAD ~ information} is transmitted between {TAIL ~ respective nodes} over telecommunication lines which may be intercepted by an adversary 
In todays systems , { HEAD ~ information } is transmitted between { TAIL ~ respective nodes } over telecommunication lines which may be intercepted by an adversary
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH