{"id":34775,"date":"2019-10-31T22:00:18","date_gmt":"2019-10-31T19:00:18","guid":{"rendered":"https:\/\/prohoster.info\/blog\/eksperiment-kak-zamaskirovat-ispolzovanie-tor-dlya-obhoda-blokirovok\/"},"modified":"2019-10-31T22:00:18","modified_gmt":"2019-10-31T19:00:18","slug":"eksperiment-kak-zamaskirovat-ispolzovanie-tor-dlya-obhoda-blokirovok","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/eksperiment-kak-zamaskirovat-ispolzovanie-tor-dlya-obhoda-blokirovok","title":{"rendered":"Eksperiment: Kuidas peita Tor'i kasutamist blokeeringute v\u00e4ltimiseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/454002\/\"><img decoding=\"async\" alt=\"Eksperiment: Kuidas peita Tor&#039;i kasutamist blokeeringute v\u00e4ltimiseks\" src=\"\/wp-content\/uploads\/2019\/05\/35921a936c3b9237cb346e52899dfdc8.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>Interneti tsensuur muutub \u00fcha t\u00f5sisemaks probleemiks kogu maailmas. See toob kaasa \u00abrelvade v\u00f5idujooksu\u00bb - valitsusasutused ja erasektorite ettev\u00f5tted erinevates riikides p\u00fc\u00fcavad blokeerida erinevat sisu ja v\u00f5itlevad piirangutest m\u00f6\u00f6dumise vahenditega, samas kui arendajad ja teadlased p\u00fc\u00fcavad luua t\u00f5husaid tsensuuri vastaseid t\u00f6\u00f6riistu. <\/p>\n<p>Carnegie Melloni, Stanfordi \u00fclikooli ja SRI Internationali teadlased viisid l\u00e4bi <noindex><a rel=\"nofollow\" href=\"https:\/\/www.frankwang.org\/files\/papers\/ccs2012.pdf\">katse<\/a><\/noindex>, mille k\u00e4igus loodi spetsiaalne teenus Tor'i kasutamise maskeerimiseks - \u00fcks populaarsemaid vahendeid blokeeringute \u00fcletamiseks. Tutvustame teile teadlaste tehtud t\u00f6\u00f6d.<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Tor blokeeringute vastu<\/h2>\n<p>\nTor tagab kasutajate anon\u00fc\u00fcmsuse, kasutades spetsiaalseid rikke - see t\u00e4hendab vahe-servereid kasutaja ja sihtm\u00e4rgiks oleva veebisaidi vahel. Tavaliselt asub kasutaja ja saidi vahel mitu riket, millest iga\u00fcks suudab dekr\u00fcpteerida vaid v\u00e4ikese andmemahu edastatavas paketis - piisavalt, et teada saada j\u00e4rgmine punkti ahelas ja saata see sinna. L\u00f5ppkokkuv\u00f5ttes, isegi kui nagu ahelasse lisada r\u00f6\u00f6bastee, mida kontrollivad kurjategijad v\u00f5i tsensorid, ei suuda nad teada ei sihtkohta ega liiklust. <\/p>\n<p>Tsensuuri vastu t\u00f6\u00f6riistana t\u00f6\u00f6tab Tor t\u00f5husalt, kuid tsensoritel on siiski v\u00f5imalus see t\u00e4ielikult blokeerida. Iraan ja Hiina on korraldanud edukaid blokeerimiskampaaniaid. Neil on \u00f5nnestunud tuvastada Tor'i liiklus TLS handshakede ja teiste Tor'i omaduste abil. <\/p>\n<p>Hiljem suutsid arendajad s\u00fcsteemi kohandada blokeeringute \u00fcletamiseks. Tsensorid vastasid HTTPS-\u00fchenduste blokeerimisega paljudele veebisaitidele, sealhulgas Torile. Projekti arendajad l\u00f5id programmi obfsproxy, mis t\u00e4iendavalt kr\u00fcpteerib liiklust. See v\u00f5istlus kestab pidevalt.<\/p>\n<h2>Eksperimendi algandmed<\/h2>\n<p>\nTeadlased otsustasid arendada t\u00f6\u00f6riista, mis v\u00f5imaldaks Tor'i kasutamise maskeerimist, et teha selle kasutamine v\u00f5imalikuks isegi piirkondades, kus s\u00fcsteem on t\u00e4ielikult blokeeritud. <\/p>\n<ul>\n<li>Algandmetena esitasid teadlased j\u00e4rgmised eeldused:<\/li>\n<li>Tsensor kontrollib isoleeritud sisemist v\u00f5rgu segmenti, mis on \u00fchendatud v\u00e4lise tsenseerimata internetiga.<\/li>\n<li>Blokeerimist\u00f6\u00f6d tegelevad asutused kontrollivad kogu v\u00f5rgus\u00fcsteemi tsenseeritavas v\u00f5rgusegmentis, kuid mitte l\u00f5ppkasutajate arvutites olevat tarkvara. <\/li>\n<li>Tsensor p\u00fc\u00fcab takistada kasutajatel juurdep\u00e4\u00e4su tema arvates soovimatutele sisule, eeldades, et k\u00f5ik sellised materjalid asuvad kontrollitava v\u00f5rgu segmendi v\u00e4listes serverites. <\/li>\n<li>Segmentide \u00e4\u00e4res olevad ruuterid anal\u00fc\u00fcsivad k\u00f5ikide paketide detsentraliseerimata andmeid, et blokeerida soovimatu sisu ja takistada vastavate paketide tungimist sisse perimeetrisse.<\/li>\n<li>K\u00f5ik Tor-i vahejaamad asuvad v\u00e4ljaspool perimeetrit. <\/li>\n<\/ul>\n<p><\/p>\n<h2>Kuidas see t\u00f6\u00f6tab<\/h2>\n<p>\nTor-i kasutamise varjamiseks on teadlased loonud t\u00f6\u00f6riista StegoTorus. Selle p\u00f5hieesm\u00e4rk on parandada Tor-i v\u00f5imet taluda automatiseeritud protokolli anal\u00fc\u00fcsi. T\u00f6\u00f6riist asub kliendi ja esimese jaama vahel, kasutades oma kr\u00fcptimisprotokolli ja steganograafia mooduleid, et raskendada Tor-i liikluse tuvastamist.<\/p>\n<p>Esimeses sammus hakkab t\u00f6\u00f6le moodul nimega chopper \u2013 see muudab liikluse erineva pikkusega plokkide j\u00e4rjestuseks, mis saadetakse edasi mitte j\u00e4rjekorras. <\/p>\n<p><img decoding=\"async\" alt=\"Eksperiment: Kuidas peita Tor&#039;i kasutamist blokeeringute v\u00e4ltimiseks\" src=\"\/wp-content\/uploads\/2019\/05\/f229ce95f4ed0513d091a43d6d868850.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmed kr\u00fcptitakse AES-i GCM-re\u017eiimis. Ploki pealkiri sisaldab 32-bitist j\u00e4rjestuse numbrit, kahte pikkuse v\u00e4lja (d ja p) \u2013 need t\u00e4histavad andmete mahtu, eraldi v\u00e4lja F ja 56-bitist kontrollimisvaldkonda, mille v\u00e4\u00e4rtus peab olema null. Ploki minimaalne pikkus on 32 baiti, maksimaalne 217 + 32 baiti. Pikkust kontrollivad steganograafia moodulid. <\/p>\n<p>\u00dchenduse loomisel on esimesed paar baiti teavet handshake-s\u00f5num, millega server m\u00f5istab, kas tegeleb juba olemas oleva v\u00f5i uue \u00fchendusega. Kui \u00fchendus kuulub uuele lingile, vastab server handshake'i abil ning iga osaleja eraldab sellest seansi v\u00f5tmed. Lisaks sellele on s\u00fcsteemis rakendatud rekeying-mehhanism \u2013 see sarnaneb seansi v\u00f5tmete eraldamisega, kuid handshake-s\u00f5numite asemel kasutatakse bloke. See mehhanism muudab j\u00e4rjestuse numbrit, kuid ei puutu lingi ID-sse. <\/p>\n<p>P\u00e4rast seda, kui m\u00f5lemad andmevahetuse osalised on saatnud ja saanud fin-ploki, suletakse link. Replay-r\u00fcnnakute v\u00f5i plokkide edastamise viivituste kaitsmiseks peavad m\u00f5lemad osalised meeles pidama ID-d selle aja jooksul p\u00e4rast sulgemist. <\/p>\n<p>Sisseehitatud steganograafia moodul peidab Tor-liiklust p2p-protokolli sisse \u2013 sarnaselt Skype'i kasutamisele kaitstud VoIP-kommunikatsioonide puhul. HTTP-steganograafia moodul simuleerib kr\u00fcptimata HTTP-liiklust. S\u00fcsteem j\u00e4ljendab tavalist kasutajat tavalise brauseriga. <\/p>\n<h2>R\u00fcnnakute vastu vastupidavus<\/h2>\n<p>\nEt kontrollida, kui t\u00f5hus on ettepanek suurendada Tor'i t\u00f6\u00f6 t\u00f5husust, t\u00f6\u00f6tasid teadlased v\u00e4lja kahte t\u00fc\u00fcpi r\u00fcnnakud. <\/p>\n<p>Esimene neist seisneb Tor'i voogude eraldamises TCP-voogudest, tuginedes Tor-protokolli p\u00f5hilistele omadustele \u2013 just seda meetodit kasutati Hiina v\u00f5imu s\u00fcsteemi blokeerimiseks. Teine r\u00fcnnak seisneb juba tuntud Tor'i voogude uurimises, et hankida teavet selle kohta, milliseid saite kasutaja k\u00fclastas. <\/p>\n<p>Teadlased kinnitasid esimese t\u00fc\u00fcbi r\u00fcnnaku t\u00f5husust 'tavalise Tor'i' vastu \u2013 selleks kogusid nad saidi k\u00fclastuste j\u00e4lgi Alexa.com'i top-10-st kaksk\u00fcmmend korda l\u00e4bi tavalise Tor'i, obfsproxy ja StegoTorus'ega koos HTTP-steganograafia mooduliga. V\u00f5rdluseks kasutati CAIDA andmestikku porti 80 kohta \u2013 peaaegu kindlasti on k\u00f5ik need HTTP-\u00fchendused.<\/p>\n<p>Eksperiment n\u00e4itas, et tavalise Tor'i tuvastamine on \u00fcsna lihtne. Tor-protokoll on liiga spetsiifiline ja omab mitmeid omadusi, mida on lihtne tuvastada \u2013 n\u00e4iteks kestavad TCP-\u00fchendused selle kasutamisel 20-30 sekundit. Obfsproxy t\u00f6\u00f6riist ei peida neid ilmselgeid aspekte peaaegu \u00fcldse. StegoTorus genereerib omakorda liiklust, mis on palju l\u00e4hemal CAIDA viidatud referentsile.<\/p>\n<p><img decoding=\"async\" alt=\"Eksperiment: Kuidas peita Tor&#039;i kasutamist blokeeringute v\u00e4ltimiseks\" src=\"\/wp-content\/uploads\/2019\/05\/bc75182d731dc854d96d8041d3a2d494.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nK\u00fclastatud saitide tuvastamise r\u00fcnnaku korral v\u00f5rreldes teadlased andmete avalikuks saamise t\u00f5en\u00e4osust 'tavalise Tor'i' ja nende lahenduse StegoTorus puhul. Hinnanguks kasutati skaala <noindex><a rel=\"nofollow\" href=\"http:\/\/fastml.com\/what-you-wanted-to-know-about-auc\/\">AUC<\/a><\/noindex> (Area Under Curve). Anal\u00fc\u00fcsi tulemused n\u00e4itasid, et tavalise Tor'i puhul, ilma t\u00e4iendava kaitseta, on t\u00f5en\u00e4osus k\u00fclastatud saitide teabe avalikuks saamisel oluliselt k\u00f5rgem.<\/p>\n<p><img decoding=\"async\" alt=\"Eksperiment: Kuidas peita Tor&#039;i kasutamist blokeeringute v\u00e4ltimiseks\" src=\"\/wp-content\/uploads\/2019\/05\/74dc8cc047ef7a38d7ae6947e23e8aa9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h2>Kokkuv\u00f5te<\/h2>\n<p>\nAjalugu riikide v\u00f5imude ja tsensuuri \u00fcmbersuunamise s\u00fcsteemide arendajate vahel n\u00e4itab, et t\u00f5husad lahendused eeldavad ainult keerulisi kaitsemeetmeid. Ainult \u00fche t\u00f6\u00f6riista kasutamine ei saa garanteerida juurdep\u00e4\u00e4su vajalikele andmetele ega seda, et teave blokeeringu \u00fcmbersuunamise kohta ei j\u00f5ua tsensuurijateni. <\/p>\n<p>Seet\u00f5ttu on oluline, et k\u00f5ikide privaatsuse ja sisu juurde p\u00e4\u00e4semise tagamise t\u00f6\u00f6riistade kasutamisel meeles pidada, et ideaalsed lahendused puuduvad ning vajadusel kombineerida erinevaid meetodeid maksimaalse efektiivsuse saavutamiseks.<\/p>\n<h2>Kasulikud lingid ja materjalid <noindex><a rel=\"nofollow\" href=\"https:\/\/infatica.io\">Infatica<\/a><\/noindex>:<\/h2>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/453168\/\">Uuring: blokeerimisele vastupidava proxy-teenuse loomine m\u00e4nguteooria abil<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/452438\/\">Loo ajaloo vastasseisust tsenseerimisele: kuidas t\u00f6\u00f6tavad MIT ja Stanfordi teadlaste loodud flash proxy meetod<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/451832\/\">Kuidas m\u00f5ista, kui proxy valetab: v\u00f5rgu proxyde f\u00fc\u00fcsiliste asukohtade verifitseerimine aktiivse geolokatsiooni algoritmi abil<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/452334\/\">Kuidas internetis varjuda: v\u00f5rreldes serverip\u00f5hiseid ja resident-proxy<\/a><\/noindex><\/li>\n<\/ul>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/infatica\/blog\/454002\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0426\u0435\u043d\u0437\u0443\u0440\u0430 \u0432 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435 \u0441\u0442\u0430\u043d\u043e\u0432\u0438\u0442\u0441\u044f \u0432\u0441\u0435 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\u0431\u043e\u0440\u044e\u0442\u0441\u044f \u0441\u043e \u0441\u0440\u0435\u0434\u0441\u0442\u0432\u0430\u043c\u0438 \u043e\u0431\u0445\u043e\u0434\u0430 \u0442\u0430\u043a\u0438\u0445 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0439, \u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0438 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0441\u0442\u0440\u0435\u043c\u044f\u0442\u0441\u044f \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u044b\u0435 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u044b \u0431\u043e\u0440\u044c\u0431\u044b \u0441 \u0446\u0435\u043d\u0437\u0443\u0440\u043e\u0439. \u0423\u0447\u0435\u043d\u044b\u0435 \u0438\u0437 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u043e\u0432 Carnegie Mellon, \u0421\u0442\u0435\u043d\u0444\u043e\u0440\u0434\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":26200,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-34775","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/eksperiment-kak-zamaskirovat-ispolzovanie-tor-dlya-obhoda-blokirovok\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"et_EE\" \/>\n\t\t<meta 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