Imeko elusizi kukhuseleko lwe-Intanethi kwi-Intanethi

I-Black Hat ifake ingxelo ngemicimbi yezokhuseleko kwi iinkqubo zokufikelela kwi I-intanethi yesathelayithi. Umbhali wengxelo ubonise amandla okuthintela ukugcwala kwabantu I-Intanethi idluliselwa ngeendlela zonxibelelwano zesathelayithi usebenzisa isamkeli seDVB esinexabiso eliphantsi.

Ngale nto wabonisa ukuba akukho nzima ukuphazamisa ukugcwala kwabantu abathunyelwe, kodwa kukho ubunzima ekuthinteleni ukugcwala okuthunyelwa ngesathelayithi kushiya umxhasi.

Kwingcaciso yakhe ukhankanya ukuba umxhasi akwazi ukunxibelelana nomboneleli wesathelayithi ngeendlela ezilinganayo okanye ezinokulinganisela:

• Kwimeko yejelo elingalinganiyo, ukugcwala okuphumayo komthengi kuthunyelwa ngomboneleli womhlaba kwaye kufunyenwe ngesathelayithi.
• Kumajelo alinganayo, i-traffic engenayo nephumayo idlula kwisathelayithi.

Iipakethi ezibhekiswe kubathengi zithunyelwa kwisathelayithi ngosasazo losasazo, ebandakanya ukugcwala kwabaxhasi abohlukeneyo, nokuba bahlala phi na.

Ukutshintshiselana ngedatha phakathi kwesathelayithi kunye nomboneleli, ugqithiso olujolisiweyo luhlala lusetyenziswa, olufuna ukuba umhlaseli abe ngamashumi eekhilomitha ukusuka kwiziseko zoncedo zomboneleli, kunye neendlela ezahlukeneyo zokuhamba rhoqo kunye neefomathi zokufaka iikhowudi, ezo Uhlalutyo lufuna izixhobo zexabiso ezivela umthengisi.

Kodwa nokuba umboneleli usebenzisa i-Ku band yesiqhelo, njengomthetho, amaza olawulo ahlukeneyo ahlukile, afuna isitya sesethelayithi sesibini ukufumana iindlela zombini nokusombulula ingxaki yexesha lokuhambisa.

Kwakucingelwa ukuba izixhobo ezizodwa ziyafuneka ukunqanda unxibelelwano ngesathelayithi, zibiza amashumi amawaka eedola, kodwa eneneni, utshilo. Uhlaselo lwenziwa kusetyenziswa i-tuner ye-DVB-S eqhelekileyo Ithelevishini yesathelayithi (i-TBS 6983/6903) kunye ne-eriyali yokulinganisa.

Iindleko ezipheleleyo zeqela lesitrayikhi lalimalunga ne-300 yeedola. Ulwazi olufumanekayo esidlangalaleni ngendawo iisathelayithi zazisetyenziselwa ukuhambisa i-eriyali kwiziphuphutheki, kwaye isicelo esiqhelekileyo sokukhangela amajelo kamabonwakude wesathelayithi asetyenziselwa ukufumana amajelo onxibelelwano.

I-eriyali yayijolise kwisathelayithi kwaye kwaqala inkqubo yokuskena kwe-Ku-band.

Imijelo ichongiwe ngokuchonga iincopho kwibala le-RF, elibonakalayo kwimeko yengxolo ngokubanzi. Emva kokuchonga incopho, ikhadi le-DVB lalilungiselelwe ukutolika kunye nokurekhoda umqondiso njengosasazo oluqhelekileyo lwevidiyo yedijithali kumabonwakude wesathelayithi.

Ngoncedo lokuvavanywa kovavanyo, ubume bezithuthi babugqityiwe kwaye idatha ye-Intanethi yahlulwa kumabonakude wedijithali (ukukhangela kwebhanal kwindawo yokulahla inkunkuma ekhutshwe yikhadi le-DVB kwasetyenziswa kusetyenziswa imaski «HTTP», ukuba ifunyenwe, yathathelwa ingqalelo ukuba ijelo elinedatha ye-Intanethi yafunyanwa).

Uphando lwezendlela lubonise okoBahlaziywa bonke ababoneleli ngeintanethi Sukusebenzisa ukubethela ngokungagqibekanga, Ukuvumela umhlaseli ave izithuthi ngaphandle kwesithintelo.

Utshintsho oluya kwi-GSE entsha (i-Generic Stream Encapsulation) yomgaqo-nkqubo wokufaka ukugcwala kwe-Intanethi kunye nokusetyenziswa kweenkqubo zokumodareyitha ezinje nge-32-D ye-modulation modulation kunye ne-APSK (iSigaba seShift Keying) khange lube nzima kuhlaselo, kodwa iindleko zokucinywa kwezixhobo ngoku incitshisiwe ukusuka kwi- $ 50,000 ukuya kwi- $ 300.

Into ebaluleke kakhulu xa idatha idluliselwa ngeendlela zonxibelelwano zesathelayithi Ukulibaziseka okukhulu kakhulu ekuhanjisweni kwepasiles (~ 700 ms), elishumi lamaxesha amakhulu kunolibaziseko ekuthumeleni iipakethi ngeendlela zonxibelelwano zomhlaba.

Ezona njongo zilula kuhlaselo lwabasebenzisi besathelayithi zii-DNS, i-HTTP engabhalwanga, kunye nokugcwala kwe-imeyile, ezisetyenziswa ngabaxhasi abangabhalwanga.

Kwi-DNS, kulula ukuhlela ukuthunyelwa kweempendulo ezingezizo ze-DNS ezinxibelelanisa idomeyini kwiserver yomhlaseli (umhlaseli angenza impendulo engeyonyani kwangoko emva kokumamela isicelo kwezithuthi, ngelixa esona sicelo kufuneka sigqithe kumboneleli wesathelayithi Ukugcwala).

Uhlalutyo lwe-imeyile lokugcwala luvumela ukukhutshwa kolwazi oluyimfihloUmzekelo, ungaqala inkqubo yokubuyisela iphasiwedi kwisiza kwaye ujonge ukugcwala okuthunyelwe nge-imeyile kunye nekhowudi yokuqinisekisa yokusebenza.

Ngexesha lokulinga, malunga ne-4 TB yedatha yafunyanwa, yadluliselwa ngeesathelayithi ezili-18. Uqwalaselo olusetyenziswe kwiimeko ezithile aluzange lubonelele ngonxibelelwano oluthembekileyo ngenxa yomyinge ophantsi womqondiso ukuya kwingxolo kunye nokwamkelwa kweepakethi ezingaphelelanga, kodwa ulwazi oluqokelelweyo lwalwanele ukwazi ukuba idatha ibonakalisiwe.

Eminye imizekelo yoko kwafunyanwa kwidatha efunyenweyo:

• Ulwazi lokuhamba kunye nolunye ulwazi lwee-avionics ezidluliselwe kwinqwelomoya lwangeniswa. Olu lwazi aluzange ludluliselwe ngaphandle kokubethela, kodwa nakwindlela enye yokugcwala kwenethiwekhi, apho abakhweli bathumela imeyile kunye nokukhangela kwiwebhusayithi.
• Ukutshintshiselana ngolwazi ngeengxaki zobugcisa kwitanki lase-Egypt kwafunyanwa. Ukongeza kulwazi lokuba inqanawa ayinakubekwa elwandle kangangenyanga, kwafunyanwa ulwazi ngegama kunye nenombolo yepaspoti yenjineli ejongene nokusombulula ingxaki.
• Igqwetha laseSpain lathumela ileta kumthengi eneenkcukacha zetyala elizayo.