De cluing lai cac cuec tan cong hO den co the xay ra, giao thirc (Firth tuyen adhoc bao m(it nhiin thirc (aware) hay SAR de duce thiet ke, no dtra tree cac giao thirc dinh tuyen MANET theo you au thong thuang nhtr AODV va DSR. SAR sir dung hai ky thuit nhu sau. Dau Wen mot gia tri do (metric) bao mot duqc then vao gei RREQ. De dot duce met mire do tin coy tot (vi dv: de birth ditnh cap nhk dung hoc nh#n dong gia moo), SAR sir dung chia se bi m#t don gian de too ra met ma h6a dei xirng tren moi mire de tin c3y sir dung ne duqc cac gel me hea. Nei each khitc, met node ce mire de tin coy khac khong the Ate duqc cac gei RREQ hoc RREP me h6a. Thir hai la co the kham pha mot tuyen thay the duce sir dung. Khi cac node khac fret' cimg met tuyen nhan cac gei RREQ tir mot nguan cu the, chung the mink mire do bio met lien quan den thong tin so do (metric) bao m#t duqc nhimg trong cac gel tin. Neu mac de tin coy dot duqc thee men, met node trung gian se bat dau xir li gai tin (vi dv: chuyen tiep ne den node tiep theo). Neu mitt de tin coy Meng th6a men, node
Phan Trung NghTa A08348 trung gian se drop gel tin. KW node dich theta man cac thuec tinh bao mat ho#c cac mac tin coy ket hop yeti toast be dtremg din du cuei (end-to-end) tir nguan den cac node dich, no tao ra met goi RREP vei se do bao mat cu the. Neu khong, no th8ng bio cho node nguin lien ket kh8ng the tiep tnc qua tuyen nay (vi no c6 the da bj xam nh3p) va do do cho phop node girl dieu chinh mac do
bio mat cis no de tim kiem met tuyen thay the. Thtrc te, do c6 the la ca hei node dee hai thay dei so do bao m#t cao han hoc thip han va lam gifin (loan luting gei tin. Day la met nhugc diem cua phuang phap SAR.
Trong so the phuang phap khac cheng Iii tin cong he den, Lee va cac doing nghiep gi6i thieu cac giao thirc djnh tuyen se ding yeu au va phan hoii xac nhon tuyen, dugc bieu dien tuang ang la CREQ va CREP. C3 phuang phap nay mei node trung gian ngoai viec girt tin RREP, no gai met tin CREQ den node ling gieng cia no theo huOng cia node dich. Sau khi nhOn dugc tin CREQ, node ling gieng tim kiem trong be dem elm no met tuyen den dich. Neu tuyen
den dich co the sir dung, node ling gieng truyen tin CREP den node nguin. Node nguen sau khi nhon tin CREP nay, kiem tra xem dueng Mn trong tin RREP c6 gieng trong CREP kh6ng. Neu dung thi thong tin djnh tuyen la chinh xac. Tuy nhien, phuung phap nay la chua di de" del ph6 yeti met c#p node cau ket yeti nhau ce ging thvc hien the cuec tin ding he den. Bei vi khi met node
ling gieng la node ciu ket, no cc!) the two va gai cac tin CREP gia chtia cac
tuyen sai. De khic phvc yin de nay, Al-Shurman va cac ding nghiep da phat minh ra met ca the lam cho node ripen phai dqi cac tin RREP den tir it nhat hai node. Tir cac gel RREP, node nguin co the danh gia chinh xac thong tin cac (Meng din. Phuang phap nay co mot diem yeu do chinh la de tre tang khi node nguin phiti dqi cac tin RREP den.
Met each tiep con khac kh8ng the cheng Igi the cuec tan cong he den nhung co the phat hie'n ra chang. Cich tiep clin nay dva hen cac phan tich efts Kurosawa vi ding nghiep. Ho phat hien ra ring met node dee hai phii tang se
the to dich de thuyet phyc node nguen tuyen dugc cung cap do IA di tog tm. Theo cac phan tich nay, met m8 hinh phat hien thong ke co the dirge xay dung de phit hien cac bit thubng, sir Mac biet tang Lang gift so tit* to dich cua the tin RREP nhjn, dieu de im chi met cac cuec ten cong he den c6 the thy ra. Trong khi cac phuang phap phat hien xam nhOp dtra tren scr bat thubng kh8ng them vito luu luting djnh tuyen hoc yeu ciu bat kt str thay doi nao trong giao thee djnh tuyen ten chting c6 the bj Mn thuang do do lam gian (loan cac lien ket.
3.2.3. Tin cong phirc top (Byzantine)
Met cute tan cong pink typ co the lit met node thea hiep hose met 'them the node thea hiep/au ket ten tuyen tit ngtain den dich. Cac node thea hiep Vitt cong mpg MANET biing each thoe hie'n the cute Yin ding nhu to the Wing Isp djnh tuyen va hueng the gei der lieu qua cac tuyen khong tOi uu dieu nay din den so giam sot hok glen don elm cac dich vu djnh tuyen.