{"id":37276,"date":"2019-10-31T22:16:42","date_gmt":"2019-10-31T19:16:42","guid":{"rendered":"https:\/\/prohoster.info\/blog\/dos-ataki-dlya-snizheniya-proizvoditelnosti-seti-tor\/"},"modified":"2019-10-31T22:16:42","modified_gmt":"2019-10-31T19:16:42","slug":"dos-ataki-dlya-snizheniya-proizvoditelnosti-seti-tor","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/dos-ataki-dlya-snizheniya-proizvoditelnosti-seti-tor","title":{"rendered":"DoS t\u00e1mad\u00e1sok a Tor h\u00e1l\u00f3zat teljes\u00edtm\u00e9ny\u00e9nek cs\u00f6kkent\u00e9s\u00e9re","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A georgetowni egyetem \u00e9s az Egyes\u00fclt \u00c1llamok Haditenger\u00e9szet\u00e9nek kutat\u00f3laborat\u00f3rium\u00e1nak csoportja elemzt\u00e9k<\/a><\/noindex> a Tor anonim h\u00e1l\u00f3zat\u00e1nak ellen\u00e1ll\u00e1sa a szolg\u00e1ltat\u00e1smegtagad\u00e1si (DoS) t\u00e1mad\u00e1sokkal szemben. A Tor h\u00e1l\u00f3zat\u00e1nak kompromitt\u00e1l\u00e1s\u00e1val kapcsolatos kutat\u00e1sok els\u0151sorban a cenz\u00far\u00e1ra (a Tor el\u00e9rhet\u0151s\u00e9g\u00e9nek blokkol\u00e1sa), a Tor-on kereszt\u00fcl \u00e9rkez\u0151 k\u00e9r\u00e9sek meghat\u00e1roz\u00e1s\u00e1ra a tranzittov\u00e1bb\u00edt\u00e1s sor\u00e1n, valamint a forgalom korrel\u00e1ci\u00f3j\u00e1nak elemz\u00e9s\u00e9re \u00f6sszpontos\u00edtanak a bel\u00e9p\u00e9si \u00e9s kil\u00e9p\u00e9si csom\u00f3pontok el\u0151tt a felhaszn\u00e1l\u00f3k deanonimiz\u00e1l\u00e1s\u00e1hoz. A bemutatott kutat\u00e1s megmutatja, hogy a DoS-t\u00e1mad\u00e1sok megszervez\u00e9se a Tor ellen figyelmen k\u00edv\u00fcl marad, \u00e9s havi n\u00e9h\u00e1ny ezer doll\u00e1ros k\u00f6lts\u00e9ggel teljesen lehets\u00e9ges olyan k\u00f6r\u00fclm\u00e9nyek kialak\u00edt\u00e1sa, amelyek megsz\u00fcntetik a Tor norm\u00e1lis m\u0171k\u00f6d\u00e9s\u00e9t, k\u00e9nyszer\u00edtve ezzel a felhaszn\u00e1l\u00f3kat a Tor haszn\u00e1lat\u00e1nak le\u00e1ll\u00edt\u00e1s\u00e1ra a gyenge teljes\u00edtm\u00e9ny miatt.<\/p>\n

A kutat\u00f3k h\u00e1rom DoS-t\u00e1mad\u00e1si forgat\u00f3k\u00f6nyvet javasoltak: torl\u00f3d\u00e1sok l\u00e9trehoz\u00e1sa a h\u00eddcsom\u00f3pontok k\u00f6z\u00f6tt, a terhel\u00e9s kiegyens\u00falyozatlans\u00e1ga, \u00e9s torl\u00f3d\u00e1sok l\u00e9trehoz\u00e1sa a rel\u00e9k k\u00f6z\u00f6tt, amelyekhez a t\u00e1mad\u00f3nak 30, 5 \u00e9s 3 Gbit\/s \u00e1tviteli sebess\u00e9gre van sz\u00fcks\u00e9ge. P\u00e9nzben kifejezve a t\u00e1mad\u00e1s k\u00f6lts\u00e9ge egy h\u00f3napra 17, 2.8 \u00e9s 1.6 ezer doll\u00e1r lesz, \u00e1m a Tor m\u0171k\u00f6d\u00e9s\u00e9nek megszak\u00edt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges DDoS-t\u00e1mad\u00e1snak 512.73 Gbit\/s s\u00e1vsz\u00e9less\u00e9gre van sz\u00fcks\u00e9ge, amely havi 7.2 milli\u00f3 doll\u00e1rba ker\u00fcl.<\/p>\n

Az els\u0151 m\u00f3dszer havi 17 ezer doll\u00e1r k\u00f6lts\u00e9ggel, egy korl\u00e1tozott sz\u00e1m\u00fa h\u00eddcsom\u00f3pont floodol\u00e1s\u00e1val, 30 Gbit\/s intenzit\u00e1ssal 44%-kal cs\u00f6kkenti a felhaszn\u00e1l\u00f3k adatlet\u00f6lt\u00e9si sebess\u00e9g\u00e9t. A tesztel\u00e9s sor\u00e1n csak 12 obfs4 h\u00eddcsom\u00f3pont m\u0171k\u00f6d\u00f6tt a 38-b\u00f3l (ezek nem szerepelnek a nyilv\u00e1nos szerverek<\/a> katal\u00f3gusokban, \u00e9s a v\u00e9dett csom\u00f3pontok blokkol\u00e1s\u00e1nak megker\u00fcl\u00e9s\u00e9re haszn\u00e1lj\u00e1k), ami lehet\u0151v\u00e9 teszi a fennmarad\u00f3, m\u0171k\u00f6d\u0151 h\u00eddcsom\u00f3pontok c\u00e9lzott floodol\u00e1s\u00e1t. A Tor fejleszt\u0151i megdupl\u00e1zhatj\u00e1k a t\u00e1mogat\u00e1si k\u00f6lts\u00e9geket, \u00e9s helyre\u00e1ll\u00edthatj\u00e1k a hi\u00e1nyz\u00f3 csom\u00f3pontok m\u0171k\u00f6d\u00e9s\u00e9t, de a t\u00e1mad\u00f3nak elegend\u0151, ha havi 31 ezer doll\u00e1rra n\u00f6veli k\u00f6lts\u00e9geit, hogy minden 38 h\u00eddcsom\u00f3pontra t\u00e1mad\u00e1st ind\u00edthasson.<\/p>\n

A m\u00e1sodik m\u00f3dszer, amely 5 Gbit\/s-ot ig\u00e9nyel a t\u00e1mad\u00e1shoz, a TorFlow k\u00f6zpontos\u00edtott s\u00e1vsz\u00e9less\u00e9gm\u00e9r\u0151 rendszer\u00e9nek le\u00e1ll\u00edt\u00e1s\u00e1ra \u00e9p\u00fcl, \u00e9s lehet\u0151v\u00e9 teszi az adatok \u00e1tlagos let\u00f6lt\u00e9si sebess\u00e9g\u00e9nek 80%-os cs\u00f6kkent\u00e9s\u00e9t az \u00fcgyfelek sz\u00e1m\u00e1ra. A TorFlow a terhel\u00e9seloszt\u00e1sra szolg\u00e1l, ami a t\u00e1mad\u00e1s sor\u00e1n megzavarja a forgalom eloszl\u00e1s\u00e1t, \u00e9s lehet\u0151v\u00e9 teszi, hogy az \u00e1tmenjen egy korl\u00e1tozott sz\u00e1m\u00fa szerveren, ami azok t\u00falterhel\u00e9s\u00e9t okozza.<\/p>\n

A harmadik m\u00f3dszer, amelyhez elegend\u0151 3 Gbit\/s, egy m\u00f3dos\u00edtott Tor-kliens haszn\u00e1lat\u00e1n alapul, amely parazita terhel\u00e9st gener\u00e1l, lehet\u0151v\u00e9 t\u00e9ve a klienslet\u00f6lt\u00e9sek sebess\u00e9g\u00e9nek 47%-os cs\u00f6kkent\u00e9s\u00e9t havi 1,6 ezer doll\u00e1ros k\u00f6lts\u00e9ggel. A t\u00e1mad\u00e1si k\u00f6lts\u00e9g 6,3 ezer doll\u00e1rra t\u00f6rt\u00e9n\u0151 emel\u00e9s\u00e9vel 120%-os cs\u00f6kkent\u00e9s \u00e9rhet\u0151 el a klienslet\u00f6lt\u00e9sek sebess\u00e9g\u00e9ben. A m\u00f3dos\u00edtott kliens a h\u00e1romcsom\u00f3pontos (bel\u00e9p\u00e9si, k\u00f6ztes \u00e9s kil\u00e9p\u0151) l\u00e1nc helyett lehet\u0151v\u00e9 teszi a protokoll \u00e1ltal megengedett nyolccsom\u00f3pontos l\u00e1ncot a csom\u00f3pontok k\u00f6z\u00f6tti maxim\u00e1lis ugr\u00e1ssz\u00e1mmal, ezut\u00e1n nagy f\u00e1jlok let\u00f6lt\u00e9s\u00e9t k\u00e9ri, \u00e9s le\u00e1ll\u00edtja az olvas\u00e1si m\u0171veleteket a k\u00e9r\u00e9sek elk\u00fcld\u00e9se ut\u00e1n, de folytatja az SENDME parancsok k\u00fcld\u00e9s\u00e9t, utas\u00edtva a bel\u00e9p\u0151 csom\u00f3pontokat az adatok tov\u00e1bb\u00edt\u00e1s\u00e1nak folytat\u00e1s\u00e1ra. <\/p>\n

Megjegyzend\u0151, hogy a szolg\u00e1ltat\u00e1smegtagad\u00e1s kezdem\u00e9nyez\u00e9se szignifik\u00e1nsan hat\u00e9konyabb, mint a Sybil m\u00f3dszerrel t\u00f6rt\u00e9n\u0151 DoS-t\u00e1mad\u00e1s a hasonl\u00f3 k\u00f6lts\u00e9gek mellett. A Sybil m\u00f3dszer a Tor h\u00e1l\u00f3zatban sz\u00e1mos saj\u00e1t rel\u00e9 elhelyez\u00e9s\u00e9re \u00e9p\u00fcl, amelyeken kereszt\u00fcl l\u00e1ncokat lehet dobni vagy a s\u00e1vsz\u00e9less\u00e9get lehet cs\u00f6kkenteni. 30, 5 \u00e9s 3 Gbit\/s-os k\u00f6lts\u00e9gvet\u00e9ssel a Sybil m\u00f3dszer 32%, 7,2% \u00e9s 4,5%-os teljes\u00edtm\u00e9nycs\u00f6kken\u00e9st eredm\u00e9nyez a kil\u00e9p\u0151 csom\u00f3pontoknak, m\u00edg a kutat\u00e1s keretein bel\u00fcl javasolt DoS-t\u00e1mad\u00e1sok az \u00f6sszes csom\u00f3pontot lefedik.<\/p>\n

Ha a k\u00f6lts\u00e9geket m\u00e1s t\u00e1mad\u00e1si form\u00e1khoz hasonl\u00edtjuk, akkor a felhaszn\u00e1l\u00f3k deanonimiz\u00e1l\u00e1s\u00e1ra ir\u00e1nyul\u00f3 t\u00e1mad\u00e1s 30 Gbit\/s-os k\u00f6lts\u00e9gvet\u00e9ssel 21%-os ellen\u0151rz\u00e9st tesz lehet\u0151v\u00e9 a bej\u00f6v\u0151 \u00e9s 5,3%-os ellen\u0151rz\u00e9st a kimen\u0151 csom\u00f3pontok felett, \u00e9s az \u00f6sszes csom\u00f3pont lefedetts\u00e9ge 1,1%-ot \u00e9r el. Az 5 \u00e9s 3 Gbit\/s-os k\u00f6lts\u00e9gvet\u00e9sekn\u00e9l a hat\u00e9konys\u00e1g 0,06% (4,5% bej\u00f6v\u0151, 1,2% kimen\u0151 csom\u00f3pont) \u00e9s 0,02% (2,8% bej\u00f6v\u0151, 0,8% kimen\u0151 csom\u00f3pont) lesz.<\/p>\n

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

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0414\u0436\u043e\u0440\u0434\u0436\u0442\u0430\u0443\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0439 \u043b\u0430\u0431\u043e\u0440\u0430\u0442\u043e\u0440\u0438\u0438 \u0412\u041c\u0421 \u0421\u0428\u0410 \u043f\u0440\u043e\u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c \u0430\u043d\u043e\u043d\u0438\u043c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 Tor \u043a \u0430\u0442\u0430\u043a\u0430\u043c, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0438\u043c \u043a \u043e\u0442\u043a\u0430\u0437\u0443 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 (DoS). \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u0438 \u0441\u0435\u0442\u0438 Tor \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u043c \u0441\u0442\u0440\u043e\u044f\u0442\u0441\u044f \u0432\u043e\u043a\u0440\u0443\u0433 \u0446\u0435\u043d\u0437\u0443\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f (\u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a Tor), \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0447\u0435\u0440\u0435\u0437 Tor \u0432 \u0442\u0440\u0430\u043d\u0437\u0438\u0442\u043d\u043e\u043c \u0442\u0440\u0430\u0444\u0438\u043a\u0435 \u0438 \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u043a\u043e\u0440\u0440\u0435\u043b\u044f\u0446\u0438\u0438 \u043f\u043e\u0442\u043e\u043a\u043e\u0432 \u0442\u0440\u0430\u0444\u0438\u043a\u0430 \u043f\u0435\u0440\u0435\u0434 \u0432\u0445\u043e\u0434\u043d\u044b\u043c \u0443\u0437\u043b\u043e\u043c \u0438 \u043f\u043e\u0441\u043b\u0435 \u0432\u044b\u0445\u043e\u0434\u043d\u043e\u0433\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-37276","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47DoS-t\u00e1mad\u00e1sok a Tor-h\u00e1l\u00f3zat teljes\u00edtm\u00e9ny\u00e9nek cs\u00f6kkent\u00e9s\u00e9re | ProHoster","description":"A Georgetowni Egyetem \u00e9s az Egyes\u00fclt \u00c1llamok Haditenger\u00e9szeti Kutat\u00f3 Laborat\u00f3riuma kutat\u00f3csoportja elemezte.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/dos-ataki-dlya-snizheniya-proizvoditelnosti-seti-tor","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47DoS-\u0430\u0442\u0430\u043a\u0438 \u0434\u043b\u044f \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0441\u0435\u0442\u0438 Tor | ProHoster","og:description":"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0414\u0436\u043e\u0440\u0434\u0436\u0442\u0430\u0443\u043d\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u0438 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u043e\u0439 \u043b\u0430\u0431\u043e\u0440\u0430\u0442\u043e\u0440\u0438\u0438 \u0412\u041c\u0421 \u0421\u0428\u0410 \u043f\u0440\u043e\u0430\u043d\u0430\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043b\u0438.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/dos-ataki-dlya-snizheniya-proizvoditelnosti-seti-tor","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2019-10-31T19:16:42+00:00","article:modified_time":"2019-10-31T19:16:42+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"37276","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":"2026-02-09 17:59:22","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-03-01 01:30:00","updated":"2026-02-09 17:59:22","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/37276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=37276"}],"version-history":[{"count":1,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/37276\/revisions"}],"predecessor-version":[{"id":158595,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/37276\/revisions\/158595"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=37276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=37276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=37276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}