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