{"id":31080,"date":"2019-10-31T21:39:19","date_gmt":"2019-10-31T18:39:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/steganografiya-v-fajlovoj-sisteme\/"},"modified":"2019-10-31T21:39:19","modified_gmt":"2019-10-31T18:39:19","slug":"steganografiya-v-fajlovoj-sisteme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/steganografiya-v-fajlovoj-sisteme","title":{"rendered":"Steganografia n\u00eb sistemin e dosjeve","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>P\u00ebrsh\u00ebndetje, Habr. <\/p>\n<p><\/p>\n<p>D\u00ebshiroj t'ju prezantoj nj\u00eb projekt t\u00eb vog\u00ebl mbi <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%A1%D1%82%D0%B5%D0%B3%D0%B0%D0%BD%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D1%8F\">steganografin\u00eb<\/a><\/noindex>, i b\u00ebr\u00eb n\u00eb koh\u00ebn time t\u00eb lir\u00eb nga studimet. <\/p>\n<p><\/p>\n<p>Kam realizuar nj\u00eb projekt p\u00ebr ruajtjen e fsheht\u00eb t\u00eb informacionit n\u00eb sistemin e skedar\u00ebve (m\u00eb posht\u00eb <strong>FS<\/strong>).<br \/>\nKjo mund t\u00eb p\u00ebrdoret p\u00ebr vjedhjen e informacionit t\u00eb ndjesh\u00ebm p\u00ebr q\u00ebllime edukative.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Steganografia n\u00eb sistemin e dosjeve\" src=\"\/wp-content\/uploads\/2019\/04\/d6639b37e1b1fe57b80288e671176fe3.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Si nj\u00eb most\u00ebr eksperimentale ishte zgjedhur nj\u00eb sistem skedar\u00ebsh t\u00eb vjet\u00ebr linuks, <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Ext2\">ext2<\/a><\/noindex>. <\/p>\n<p>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3 id=\"realizaciya\">Implementimi<\/h3>\n<p><\/p>\n<h4 id=\"soobrazheniya-o-realizacii\">Konsideratat p\u00ebr zbatimin<\/h4>\n<p><\/p>\n<p>N\u00ebse e analizoni mir\u00eb standardin ext2, mund t\u00eb z\u00ebvend\u00ebsoni q\u00eb n\u00eb FS ekziston nj\u00eb e ashtuquajtur <noindex><a rel=\"nofollow\" href=\"http:\/\/www.nongnu.org\/ext2-doc\/ext2.html#SUPERBLOCK\"><strong>Superblock<\/strong><\/a><\/noindex>, n\u00eb t\u00eb cilin jepet informacioni kryesor rreth sistemit. M\u00eb pas, un\u00eb gjeta <noindex><a rel=\"nofollow\" href=\"http:\/\/www.nongnu.org\/ext2-doc\/ext2.html#BLOCK-BITMAP\"><strong>Block Bitmap<\/strong><\/a><\/noindex> dhe <noindex><a rel=\"nofollow\" href=\"http:\/\/www.nongnu.org\/ext2-doc\/ext2.html#INODE-TABLE\"><strong>Tabela e Inode-ve.<\/strong><\/a><\/noindex>. Pothuajse menj\u00ebher\u00eb lindi ideja p\u00ebr t\u00eb regjistruar informacionin n\u00eb blloqet p\u00ebr momentin bosh t\u00eb FS. Tani duhej t\u00eb mendohej p\u00ebr mbrojtjen nga programuesi, i armatosur me <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Hex-%D1%80%D0%B5%D0%B4%D0%B0%D0%BA%D1%82%D0%BE%D1%80\">editorin hex<\/a><\/noindex>. <\/p>\n<p><\/p>\n<p>N\u00ebse ruhet informacioni i fsheht\u00eb pa enkriptim, at\u00ebher\u00eb, p\u00ebrkund\u00ebr paqart\u00ebsis\u00eb s\u00eb tij n\u00eb FS, do t\u00eb jet\u00eb ende shum\u00eb i duksh\u00ebm, ve\u00e7an\u00ebrisht n\u00ebse programuesi e di se \u00e7far\u00eb duhet t\u00eb k\u00ebrkoj\u00eb. Prandaj, u mor vendimi p\u00ebr t\u00eb enkriptuar t\u00eb gjitha blloqet e skedarit origjinal. Kam zgjedhur enkriptimin me bllok, <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Advanced_Encryption_Standard\">AES<\/a><\/noindex>por si\u00e7 e kuptoni, kjo nuk \u00ebsht\u00eb thelb\u00ebsore.<\/p>\n<p><\/p>\n<p>P\u00ebr t\u00eb ndar\u00eb blloqet e nevojshme nga t\u00eb tjer\u00ebt gjat\u00eb leximit, u vendos t\u00eb shtohet nj\u00eb shenj\u00eb speciale n\u00eb fillim t\u00eb \u00e7do blloku. Kjo shenj\u00eb u enkriptua n\u00eb var\u00ebsi t\u00eb numrit t\u00eb bllokut n\u00eb skedarin origjinal. Kjo strategji lejon jo vet\u00ebm t\u00eb gjeje blloqet e nevojshme, por edhe t\u00eb zbuloje rendin e tyre t\u00eb sakt\u00eb.<\/p>\n<p><\/p>\n<p>Parimi i p\u00ebrgjithsh\u00ebm i pun\u00ebs s\u00eb sistemit.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Steganografia n\u00eb sistemin e dosjeve\" src=\"\/wp-content\/uploads\/2019\/04\/cb6e712aeffafe87b1ad10e4ed5b0a39.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<h4 id=\"algoritm-zapisi\">Algoritmi i regjistrimit<\/h4>\n<p><\/p>\n<p>Hapat:<\/p>\n<p><\/p>\n<ul>\n<li>S\u00eb pari, shkruani ndonj\u00eb informacion n\u00eb sistemin e skedar\u00ebve origjinal;<\/li>\n<li>Fshihni k\u00ebt\u00eb informacion (nuk \u00ebsht\u00eb e nevojshme t\u00eb fshihni t\u00eb gjith\u00eb); <\/li>\n<li>Shkruani skedarin p\u00ebr t'u fshehur n\u00eb blloqe me gjat\u00ebsi t\u00eb barabart\u00eb, duke shtuar nj\u00eb shenj\u00eb;<\/li>\n<li>Enkriptoni k\u00ebto blloqe;<\/li>\n<li>Vendosni blloqet e enkriptuara n\u00eb blloqet bosh t\u00eb FS.<\/li>\n<\/ul>\n<p>\n<b class=\"spoiler_title\">P\u00ebr adhuruesit e diagrameve t\u00eb bllokut<\/b><\/p>\n<p>M\u00eb posht\u00eb paraqitet nj\u00eb diagram blloku i algoritmit t\u00eb regjistrimit. N\u00eb hyrje, algoritmi merr kat\u00ebr skedare:<br \/>\n- Imazhin e sistemit t\u00eb skedar\u00ebve q\u00eb do t\u00eb ndryshohet;<br \/>\n- Skedarin q\u00eb do t\u00eb n\u00ebnshtrohet steganografis\u00eb;<br \/>\n- Skedarin me \u00e7el\u00ebsin e enkriptimit p\u00ebr AES;<br \/>\n- Skedarin me shenj\u00ebn.<br \/>\n<img decoding=\"async\" alt=\"Steganografia n\u00eb sistemin e dosjeve\" src=\"\/wp-content\/uploads\/2019\/04\/3089bf0d55cbdca1a98e4ee992089665.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Menj\u00ebher\u00eb duhet theksuar se ky algorit\u00ebm ka nj\u00eb disavantazh: pas regjistrimit t\u00eb skedarit n\u00eb FS, <strong>p\u00ebr shkak t\u00eb ndryshimeve q\u00eb nuk jan\u00eb marr\u00eb parasysh n\u00eb paket\u00ebn R \u2014 presim q\u00eb t\u00eb rregullojn\u00eb.<\/strong> nuk mund t\u00eb shkruani ndonj\u00eb informacion t\u00eb ri n\u00eb FS, pasi \u00e7do informacion i ri mund t\u00eb mbuloj\u00eb blloqet q\u00eb kemi rezervuar p\u00ebr skedarin ton\u00eb t\u00eb steganografuar, megjithat\u00eb, kjo hap mund\u00ebsin\u00eb e \"pastrimit t\u00eb shpejt\u00eb t\u00eb gjurm\u00ebve\". <\/p>\n<p><\/p>\n<p>Porosin\u00eb \u00ebsht\u00eb e qart\u00eb se si mund t\u00eb rregullohet: \u00ebsht\u00eb e nevojshme t\u00eb riprogramohet algoritmi p\u00ebr regjistrimin e blloqeve n\u00eb FS. Kjo \u00ebsht\u00eb nj\u00eb detyr\u00eb e qart\u00eb, por jasht\u00ebzakonisht e lodhshme.<br \/>\nP\u00ebr q\u00ebllime t\u00eb Proof Of Concept nuk e kam realizuar k\u00ebt\u00eb.<\/p>\n<p><\/p>\n<p>Si rezultat, do t\u00eb kemi ndryshime t\u00eb tilla n\u00eb FS, ja si duket FS para steganografis\u00eb (nj\u00eb skedar audio \u00ebsht\u00eb regjistruar paraprakisht).<br \/>\n<img decoding=\"async\" alt=\"Steganografia n\u00eb sistemin e dosjeve\" src=\"\/wp-content\/uploads\/2019\/04\/a779de50121de2bafacab9d891b5f5df.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nJa si duket FS me informacion t\u00eb steganografuar tashm\u00eb.<br \/>\n<img decoding=\"async\" alt=\"Steganografia n\u00eb sistemin e dosjeve\" src=\"\/wp-content\/uploads\/2019\/04\/5722200a90d720f96c0aad5b4a5a11ae.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<h4 id=\"algoritm-chteniya\">Algoritmi i leximit<\/h4>\n<p><\/p>\n<p>Hapat:<\/p>\n<p><\/p>\n<ul>\n<li>Duke ditur \u00e7el\u00ebsin dhe m\u00ebnyr\u00ebn e nd\u00ebrtimit t\u00eb markave, krijohet grupi i par\u00eb i N markave, me garanci q\u00eb N, t\u00eb shum\u00ebzohet me gjat\u00ebsin\u00eb e bllokut t\u00eb sistemit t\u00eb skedarit, \u00ebsht\u00eb m\u00eb e madhe se gjat\u00ebsia e skedarit t\u00eb steganografuar.<\/li>\n<li>T\u00eb k\u00ebrkosh blloqet n\u00eb FS q\u00eb fillojn\u00eb me markat; <\/li>\n<li>Dekripto blloqet e marra dhe ndaje markat;<\/li>\n<li>Mblidh blloqet e marra n\u00eb rendin e duhur dhe merr skedarin origjinal.<\/li>\n<\/ul>\n<p>\n<b class=\"spoiler_title\">P\u00ebr adhuruesit e diagrameve t\u00eb bllokut<\/b><\/p>\n<p>M\u00eb posht\u00eb \u00ebsht\u00eb paraqitur nj\u00eb diagram i algoritmit t\u00eb regjistrimit. N\u00eb hyrje, algoritmi merr tre skedar\u00eb:<br \/>\n-Imazhi i sistemit t\u00eb skedar\u00ebve;<br \/>\n- Skedarin me \u00e7el\u00ebsin e enkriptimit p\u00ebr AES;<br \/>\n- Skedarin me shenj\u00ebn.<br \/>\n<img decoding=\"async\" alt=\"Steganografia n\u00eb sistemin e dosjeve\" src=\"\/wp-content\/uploads\/2019\/04\/9dcfe680121a30c1b17b5a4cdbd76dc3.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Pas ekzekutimit t\u00eb programit, shfaqet skedari Read, i cili do t\u00eb jet\u00eb skedari i nxjerr\u00eb nga FS-ja steganografike, n\u00ebse \u00e7el\u00ebsi ose marka jan\u00eb specifikuar gabimisht, at\u00ebher\u00eb skedari Read do t\u00eb jet\u00eb i zbraz\u00ebt.<br \/>\n(p\u00ebr ata q\u00eb p\u00eblqejn\u00eb bukurit\u00eb, mund t\u00eb p\u00ebrfshini jo vet\u00ebm skedarin, por edhe \"kryesin\u00eb\", e cila p\u00ebrmban meta-informacione: emri i skedarit, t\u00eb drejtat, koha e ndryshimit t\u00eb fundit, etj.)<\/p>\n<p><\/p>\n<h4 id=\"avtomatizaciya-zapuska\">Automatizimi i ekzekutimit<\/h4>\n<p><\/p>\n<p>P\u00ebr leht\u00ebsin\u00eb, jan\u00eb shkruar skripte bash q\u00eb automatizojn\u00eb ekzekutimin n\u00eb Linux (testuar n\u00eb Ubuntu 16.04.3 LTS).<br \/>\nT\u00eb analizojm\u00eb ekzekutimin hap pas hapi.<br \/>\nShkrimi:<\/p>\n<p><\/p>\n<ol>\n<li>sudo Copy_Flash.sh \u201cDEVICE\u201d \u2014 marrim imazhin e FS nga DEVICE (flash);<\/li>\n<li>.\\\/Write.sh \u201cFILE\u201d \u201cKEY\u201d \u201cMARKER\u201d \u2013 krijojm\u00eb nj\u00eb mjedis virtual, shkarkojm\u00eb librarit\u00eb e nevojshme dhe startojm\u00eb skriptin p\u00ebr regjistrim;<\/li>\n<li>sudo .\\\/Write_Flash.sh \u201cDEVICE\u201d \u2013 regjistrojm\u00eb FS-n\u00eb e modifikuar s\u00ebrish n\u00eb DEVICE.<\/li>\n<\/ol>\n<p><\/p>\n<p>Leximi:<\/p>\n<p><\/p>\n<ol>\n<li>sudo Copy_Flash.sh \u201cDEVICE\u201d \u2014 marrim imazhin e FS nga DEVICE (flash);<\/li>\n<li>.\\\/Read.sh \u201cKEY\u201d \u2018MARKER\u201d \u2014 krijojm\u00eb nj\u00eb mjedis virtual, shkarkojm\u00eb librarit\u00eb e nevojshme dhe startojm\u00eb skriptin p\u00ebr lexim;<\/li>\n<li>N\u00eb katalogun aktual hapim skedarin Read \u2013 ky \u00ebsht\u00eb informacioni i steganografuar.<\/li>\n<\/ol>\n<p><\/p>\n<h3 id=\"zaklyuchenie\">P\u00ebrfundim<\/h3>\n<p><\/p>\n<p>Ky metod i steganografis\u00eb, ndoshta, ka nevoj\u00eb p\u00ebr p\u00ebrmir\u00ebsim, testim t\u00eb m\u00ebtejsh\u00ebm dhe zgjerim n\u00eb sisteme skedar\u00ebsh m\u00eb t\u00eb njohura, si\u00e7 jan\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/FAT32\">Fat32<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/NTFS\">NTFS<\/a><\/noindex> dhe <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Ext4\">ext4<\/a><\/noindex>.<br \/>\nPor q\u00ebllimi i k\u00ebtij punimi ishte t\u00eb tregonte principin, me an\u00eb t\u00eb t\u00eb cilit mund t\u00eb realizohet ruajtja e fsheht\u00eb e informacionit n\u00eb sistemin e skedar\u00ebve.<br \/>\nMe k\u00ebto algoritme, mund t\u00eb ruani informacionin pa frik\u00eb, dhe nd\u00ebrsa, duke ditur \u00e7el\u00ebsin, \u00ebsht\u00eb e mundur t\u00eb thyehet nj\u00eb sistem t\u00eb till\u00eb jo p\u00ebrmes p\u00ebrmbytjes s\u00eb plot\u00eb (por me nj\u00eb algorit\u00ebm mjaft t\u00eb gjat\u00eb), pa njohuri p\u00ebr \u00e7el\u00ebsin, kjo sistem m\u00eb duket krejt\u00ebsisht i q\u00ebndruesh\u00ebm; gjithsesi, kjo mund t\u00eb sh\u00ebrbej\u00eb si shkak p\u00ebr nj\u00eb artikull t\u00eb ve\u00e7ant\u00eb.<\/p>\n<p><\/p>\n<p>I gjith\u00eb kodi \u00ebsht\u00eb realizuar n\u00eb gjuh\u00ebn Python versioni 3.5.2. <noindex><a rel=\"nofollow\" href=\"https:\/\/youtu.be\/FEAE3_xDKkA\">Shembulli i pun\u00ebs<\/a><\/noindex> \u00ebsht\u00eb paraqitur n\u00eb kanalin tim youtube. Kodi i plot\u00eb i projektit \u00ebsht\u00eb publikuar n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/MalahovMV\/Ext2Stego\">github<\/a><\/noindex>.<br \/>\n(Po, po, e di q\u00eb p\u00ebr versionin production duhet t\u00eb shkruhet n\u00eb di\u00e7ka \"t\u00eb shpejt\u00eb\", p\u00ebr shembull n\u00eb C \ud83d\ude09 )<br \/>\nN\u00eb k\u00ebt\u00eb realizim, madh\u00ebsia e skedarit hyr\u00ebs p\u00ebr steganografin\u00eb nuk duhet t\u00eb kaloj\u00eb 1000 kB.<\/p>\n<p><\/p>\n<p>D\u00ebshiroj t\u00eb shpreh mir\u00ebnjohje p\u00ebrdoruesit <noindex><a rel=\"nofollow\" href=\"https:\/\/habrahabr.ru\/users\/pavelmstu\/\" class=\"user_link\">PavelMSTU<\/a><\/noindex> p\u00ebr k\u00ebshillat e \u00e7muara gjat\u00eb planifikimit t\u00eb hulumtimit dhe rekomandimet p\u00ebr p\u00ebrgatitjen e artikullit.<\/p>\n<p>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/347604\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440. \u0425\u043e\u0447\u0443 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0432\u0430\u043c \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u043f\u0440\u043e\u0435\u043a\u0442 \u043f\u043e \u0441\u0442\u0435\u0433\u0430\u043d\u043e\u0433\u0440\u0430\u0444\u0438\u0438, \u0441\u0434\u0435\u043b\u0430\u043d\u043d\u044b\u0439 \u0432 \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0435 \u043e\u0442 \u0443\u0447\u0435\u0431\u044b \u0432\u0440\u0435\u043c\u044f. \u042f \u0441\u0434\u0435\u043b\u0430\u043b \u043f\u0440\u043e\u0435\u043a\u0442 \u043f\u043e \u0441\u043a\u0440\u044b\u0442\u043e\u043c\u0443 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0432 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