{"id":31079,"date":"2019-10-31T21:39:19","date_gmt":"2019-10-31T18:39:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/tcp-steganografiya-ili-kak-skryt-peredachu-dannyh-v-internete\/"},"modified":"2019-10-31T21:39:19","modified_gmt":"2019-10-31T18:39:19","slug":"tcp-steganografiya-ili-kak-skryt-peredachu-dannyh-v-internete","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/tcp-steganografiya-ili-kak-skryt-peredachu-dannyh-v-internete","title":{"rendered":"Steganoografia TCP ose si t\u00eb fsheh\u00ebsh transmetimin e t\u00eb dh\u00ebnave n\u00eb internet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Steganoografia
\n
\nK\u00ebrkuesit polak\u00eb propozuan nj\u00eb m\u00ebnyr\u00eb t\u00eb re t\u00eb streganografis\u00eb rrjetore e cila bazohet n\u00eb ve\u00e7orit\u00eb e funksionimit t\u00eb protokollit t\u00eb nivelit t\u00eb transportit TCP. Autor\u00ebt e punimit pretendojn\u00eb se skema e tyre, p\u00ebr shembull, mund t\u00eb p\u00ebrdoret p\u00ebr d\u00ebrgimin e mesazheve t\u00eb fshehta n\u00eb vende totalitare q\u00eb aplikojn\u00eb censur\u00ebn e ashp\u00ebr t\u00eb internetit. Le t\u00eb shqyrtojm\u00eb se \u00e7far\u00eb p\u00ebrb\u00ebn sakt\u00ebsisht k\u00ebt\u00eb novacion dhe sa e dobishme \u00ebsht\u00eb ajo n\u00eb t\u00eb v\u00ebrtet\u00eb.<\/p>\n

<\/a><\/noindex><\/p>\n

S\u00eb pari, duhet t\u00eb p\u00ebrcaktojm\u00eb se \u00e7far\u00eb \u00ebsht\u00eb streganografia. K\u00ebshtu, streganografia \u00ebsht\u00eb shkenca e transmetimit t\u00eb fshehur t\u00eb mesazheve. Pra, duke p\u00ebrdorur metodat e saj, pal\u00ebt p\u00ebrpiqen t\u00eb fshehin faktin e transmetimit<\/b>. Ky \u00ebsht\u00eb ndryshimi midis k\u00ebsaj shkence dhe kriptografis\u00eb, e cila p\u00ebrpiqet t\u00eb b\u00ebj\u00eb q\u00eb p\u00ebrmbajtja e mesazhit t\u00eb jet\u00eb e paarritshme p\u00ebr lexim<\/b>. Duhet theksuar se bashk\u00ebsia profesionale e kriptograf\u00ebve \u00ebsht\u00eb mjaft mosbesuese ndaj streganografis\u00eb, p\u00ebr shkak t\u00eb af\u00ebrsis\u00eb s\u00eb ideologjis\u00eb s\u00eb saj me parimin \"Siguria p\u00ebrmes err\u00ebsir\u00ebs\". Ky parim, p\u00ebr shembull, p\u00ebrdoret nga kompania Skype Inc. \u2014 kodi burimor i aplikacionit t\u00eb njohur t\u00eb thirrjeve \u00ebsht\u00eb i mbyllur dhe askush nuk di sakt\u00ebsisht se si realizohet enkriptimi i t\u00eb dh\u00ebnave. Koh\u00ebt e fundit, ky aspekt \u00ebsht\u00eb shprehur me shqet\u00ebsim n\u00eb NSA, si\u00e7 \u00ebsht\u00eb shkruar nga specialisti i njohur Bruce Schneier shkrova<\/a><\/noindex> n\u00eb blogun e tij. <\/p>\n

Duke u rikthyer te streganografia, le t\u00eb i p\u00ebrgjigjemi pyetjes se p\u00ebrse \u00ebsht\u00eb e nevojshme, n\u00ebse kemi kriptografin\u00eb. N\u00eb t\u00eb v\u00ebrtet\u00eb, mund t\u00eb enkriptojm\u00eb nj\u00eb mesazh duke p\u00ebrdorur ndonj\u00eb algorit\u00ebm modern dhe duke p\u00ebrdorur nj\u00eb \u00e7el\u00ebs mjaft t\u00eb gjat\u00eb, askush nuk do ta lexoj\u00eb k\u00ebt\u00eb mesazh, p\u00ebrve\u00e7 n\u00ebse ju e d\u00ebshironi. Megjithat\u00eb, ndonj\u00ebher\u00eb \u00ebsht\u00eb m\u00eb e dobishme t\u00eb fshihni vet\u00eb faktin e d\u00ebrgimit sekret. P\u00ebr shembull, n\u00ebse autoritetet p\u00ebrkat\u00ebse kapin mesazhin tuaj t\u00eb enkriptuar dhe nuk mund ta dekriptojn\u00eb, por d\u00ebshirojn\u00eb ta b\u00ebjn\u00eb, at\u00ebher\u00eb n\u00eb fund t\u00eb fundit ekzistojn\u00eb edhe metoda jo kompjuterike p\u00ebr t\u00eb ndikuar dhe p\u00ebr t\u00eb nxjerr\u00eb informacionin. Mund t\u00eb ting\u00eblloj\u00eb utopike, por, prano, \u00ebsht\u00eb e mundur n\u00eb thelb. Prandaj, do t\u00eb ishte m\u00eb mir\u00eb t\u00eb b\u00ebni q\u00eb ata q\u00eb nuk duhet ta din\u00eb, t\u00eb mos din\u00eb fare q\u00eb ka pasur nj\u00eb transmetim. K\u00ebrkuesit polak\u00eb pik\u00ebrisht e propozuan nj\u00eb metod\u00eb t\u00eb till\u00eb. Dhe ata e propozojn\u00eb ta b\u00ebjn\u00eb k\u00ebt\u00eb p\u00ebrmes nj\u00eb protokolli q\u00eb \u00e7do p\u00ebrdorues i internetit e p\u00ebrdor mij\u00ebra her\u00eb n\u00eb dit\u00eb.<\/p>\n

K\u00ebtu jemi af\u00ebr Protokollit t\u00eb Kontrollit t\u00eb Transmetimit (TCP). Shpjegimi i t\u00eb gjitha detajeve t\u00eb tij, natyrisht, nuk ka kuptim \u2014 \u00ebsht\u00eb e gjat\u00eb, e m\u00ebrzitshme, ata q\u00eb kan\u00eb nevoj\u00eb, e din\u00eb. Megjithat\u00eb, mund t\u00eb themi shkurtimisht se TCP \u00ebsht\u00eb nj\u00eb protokoll i nivelit t\u00eb transportit (pra, punon \"sip\u00ebr\" IP dhe \"posht\u00eb\" protokolleve t\u00eb nivelit t\u00eb aplikacioneve, si p\u00ebr shembull HTTP, FTP ose SMTP), i cili garanton d\u00ebrges\u00ebn e besueshme t\u00eb t\u00eb dh\u00ebnave nga d\u00ebrguesi te pranuesi. D\u00ebrgimi i besuesh\u00ebm do t\u00eb thot\u00eb se n\u00ebse ndonj\u00eb paket\u00eb humbet ose vjen me ndryshime, TCP do t\u00eb kujdeset p\u00ebr d\u00ebrgimin e asaj pakete. Duhet theksuar se me ndryshime n\u00eb paket\u00eb, k\u00ebtu n\u00ebnkuptohet jo deformimi i q\u00ebllimsh\u00ebm t\u00eb t\u00eb dh\u00ebnave, por gabimet n\u00eb transmision q\u00eb ndodhin n\u00eb nivelin fizik. P\u00ebr shembull, nd\u00ebrsa paketa ishte duke kaluar p\u00ebrmes kabllove metalike, disa bit\u00eb nd\u00ebrruan vlerat e tyre p\u00ebr nj\u00eb t\u00eb kund\u00ebrt ose humb\u00ebn n\u00eb zhurm\u00eb (p\u00ebr m\u00eb tep\u00ebr, p\u00ebr Ethernet, vlera e Shkall\u00ebs s\u00eb Gabimeve t\u00eb Bit\u00ebve merr zakonisht vler\u00ebn rreth 10-8). Humbja e paketimeve gjat\u00eb rrug\u00ebs \u00ebsht\u00eb gjithashtu nj\u00eb fenomen relativisht i zakonsh\u00ebm n\u00eb internet. Ajo mund t\u00eb ndodh\u00eb, p\u00ebr shembull, p\u00ebr shkak t\u00eb ngarkes\u00ebs s\u00eb routerave, q\u00eb \u00e7on n\u00eb mbipopullimin e bufer\u00ebve dhe si pasoj\u00eb n\u00eb hedhjen e t\u00eb gjitha paketimeve t\u00eb reja q\u00eb mb\u00ebrrijn\u00eb. Zakonisht, p\u00ebrqindja e paketimeve t\u00eb humbura \u00ebsht\u00eb rreth 0.1%, dhe kur vlera \u00ebsht\u00eb disa p\u00ebrqind, TCP nuk funksionon si\u00e7 duhet \u2014 p\u00ebrdoruesi do t\u00eb ket\u00eb ngadal\u00ebsime t\u00eb r\u00ebnda.<\/p>\n

Pra, ne shohim se d\u00ebrgimi (rikthimi) i paketimeve \u00ebsht\u00eb nj\u00eb fenomen i zakonsh\u00ebm dhe i nevojsh\u00ebm p\u00ebr TCP. Pse at\u00ebher\u00eb t\u00eb mos e p\u00ebrdorim at\u00eb p\u00ebr nevojat e streganografis\u00eb, duke pasur parasysh se TCP, si\u00e7 u p\u00ebrmend m\u00eb par\u00eb, p\u00ebrdoret gjer\u00ebsisht (sipas vler\u00ebsimeve, sot p\u00ebrqindja e TCP n\u00eb internet arrin 80-95%). Thelbi i metod\u00ebs s\u00eb propozuar \u00ebsht\u00eb q\u00eb n\u00eb mesazhin e d\u00ebrguar t\u00eb d\u00ebrgosh jo at\u00eb q\u00eb ishte n\u00eb paket\u00ebn fillestare, por t\u00eb dh\u00ebnat q\u00eb po p\u00ebrpiqemi t\u00eb fshehim. N\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb, zbulimi i nj\u00eb rimbursimi t\u00eb till\u00eb nuk \u00ebsht\u00eb aq e leht\u00eb. Duhet t\u00eb dish ku t\u00eb shikosh \u2014 numri i lidhjeve TCP q\u00eb kalojn\u00eb p\u00ebrmes ofruesit \u00ebsht\u00eb thjesht i madh. N\u00ebse dihet niveli i p\u00ebrballimit t\u00eb trafikut n\u00eb rrjet, at\u00ebher\u00eb mekanizmi i streganografis\u00eb mund t\u00eb konfigurohet n\u00eb m\u00ebnyr\u00eb q\u00eb lidhja juaj t\u00eb mos dallohej nga t\u00eb tjerat. <\/p>\n

Sigurisht, kjo metod\u00eb nuk \u00ebsht\u00eb pa disavantazhe. P\u00ebr shembull, nga nj\u00eb pik\u00ebpamje praktike, implementimi i saj do t\u00eb jet\u00eb i v\u00ebshtir\u00eb \u2014 do t\u00eb k\u00ebrkoj\u00eb ndryshime n\u00eb rrjetin e stakut n\u00eb sistemet operative, megjith\u00ebse nuk ka asgj\u00eb tep\u00ebr t\u00eb komplikuar n\u00eb k\u00ebt\u00eb. P\u00ebr m\u00eb tep\u00ebr, me nj\u00eb num\u00ebr t\u00eb mjaftuesh\u00ebm burimesh, \u00ebsht\u00eb ende e mundur t\u00eb zbulohet paketat \"t\u00eb fshehta\", p\u00ebr k\u00ebt\u00eb \u00ebsht\u00eb e nevojshme t\u00eb shqyrtohet dhe analizohet \u00e7do paket\u00eb n\u00eb rrjet. Por, n\u00eb p\u00ebrgjith\u00ebsi, kjo \u00ebsht\u00eb praktikisht e pamundur, prandaj zakonisht k\u00ebrkohet p\u00ebr paketat dhe lidhjet q\u00eb duken ndryshe, dhe metoda e propozuar ndihmon p\u00ebr ta b\u00ebr\u00eb lidhjen tuaj t\u00eb duket t\u00ebr\u00ebsisht e zakonshme. Madje, askush nuk ju ndalon t\u00eb kriptoni t\u00eb dh\u00ebnat e fshehta p\u00ebr \u00e7do rast. N\u00eb k\u00ebt\u00eb m\u00ebnyr\u00eb, lidhja mund t\u00eb mbetet e paenkriptuar, p\u00ebr t\u00eb shkaktuar m\u00eb pak dyshime.<\/p>\n

Autoret e pun\u00ebs (p\u00ebr ata q\u00eb jan\u00eb t\u00eb interesuar, k\u00ebtu<\/a><\/noindex> ajo) n\u00eb nivelin e simuluar treguan se metoda e propozuar funksionon si\u00e7 \u00ebsht\u00eb menduar. Ndoshta, n\u00eb t\u00eb ardhmen, dikush do t\u00eb merret me realizimin e ides\u00eb s\u00eb tyre n\u00eb praktik\u00eb. Dhe at\u00ebher\u00eb, shpresojm\u00eb, n\u00eb internet do t\u00eb ket\u00eb pak m\u00eb pak censur\u00eb.
\n
Burimi: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Autor\u00ebt e pun\u00ebs besojn\u00eb se skema e tyre, p\u00ebr shembull, mund t\u00eb p\u00ebrdoret p\u00ebr t\u00eb d\u00ebrguar mesazhe t\u00eb fshehta n\u00eb vendet totalitare q\u00eb aplikojn\u00eb censur\u00eb t\u00eb fort\u00eb n\u00eb internet. Le t\u00eb p\u00ebrpiqemi t\u00eb kuptojm\u00eb n\u00eb \u00e7far\u00eb konsiston, n\u00eb t\u00eb v\u00ebrtet\u00eb, kjo novacion dhe sa e dobishme \u00ebsht\u00eb ajo. 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