{"id":33517,"date":"2019-10-31T21:53:04","date_gmt":"2019-10-31T18:53:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/predstavlen-bolee-effektivnyj-metod-opredeleniya-prefiksov-kollizij-dlya-sha-1\/"},"modified":"2019-10-31T21:53:04","modified_gmt":"2019-10-31T18:53:04","slug":"predstavlen-bolee-effektivnyj-metod-opredeleniya-prefiksov-kollizij-dlya-sha-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/novosti-interneta\/predstavlen-bolee-effektivnyj-metod-opredeleniya-prefiksov-kollizij-dlya-sha-1","title":{"rendered":"Esitati t\u00f5husam meetod SHA-1 kokkup\u00f5rgete prefiksite m\u00e4\u00e4ramiseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Prantsusmaa riikliku arvutitehnika ja automaatika uurimisinstituudi (INRIA) ja Nanyangi tehnoloogia\u00fclikooli (Singapur) teadlased <noindex><a rel=\"nofollow\" href=\"https:\/\/mailarchive.ietf.org\/arch\/msg\/cfrg\/NhiGvOFzcEw108YLwF_ndyfB1k4\">arendasid<\/a><\/noindex> t\u00e4iustatud <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2019\/459\">meetod<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2019\/459.pdf\">r\u00fcnnaku<\/a><\/noindex> SHA-1 algoritm, mis oluliselt lihtsustab kahe erineva dokumendi loomist, millel on sama SHA-1 ripp. Meetodi olemus seisneb SHA-1 t\u00e4ieliku kollisioonide leidmise operatsiooni v\u00e4hendamises <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9A%D0%BE%D0%BB%D0%BB%D0%B8%D0%B7%D0%B8%D0%BE%D0%BD%D0%BD%D0%B0%D1%8F_%D0%B0%D1%82%D0%B0%D0%BA%D0%B0#%D0%9A%D0%BE%D0%BB%D0%BB%D0%B8%D0%B7%D0%B8%D0%BE%D0%BD%D0%BD%D0%B0%D1%8F_%D0%B0%D1%82%D0%B0%D0%BA%D0%B0_%D1%81_%D0%B7%D0%B0%D0%B4%D0%B0%D0%BD%D0%BD%D1%8B%D0%BC_%D0%BF%D1%80%D0%B5%D1%84%D0%B8%D0%BA%D1%81%D0%BE%D0%BC\">kollektiivsete r\u00fcnnakute teostamiseks, kus kollisioon ilmneb p\u00e4rast teatud prefiksite esinemist, s\u00f5ltumatult komplekti muudest andmetest. Teisis\u00f5nu, saab arvutada kaks eelnevalt m\u00e4\u00e4ratud prefiksit ja kui \u00fche liita \u00fche dokumendiga ja teise teisega \u2013 siis nende failide SHA-1 rippud on identsed.<\/a><\/noindex>, mille \u00fchinemise korral, kus konflikt tekib teatud prefiksite olemasolu t\u00f5ttu, olenemata muudest andmetest kogumis. Teisis\u00f5nu, on v\u00f5imalik arvutada kaks eeldefineeritud prefiksi ning kui \u00fcks liita \u00fche dokumendiga ja teine teisega \u2014 nende failide SHA-1 hash'id on samad.<\/p>\n<p>See type attacks still require enormous computational power, and prefix searching remains more complex than regular collision matching, but the practical effectiveness of the results is significantly higher. While the fastest method for finding prefix collisions in SHA-1 previously required 277.1 operations, the new method reduces the computation range to between 266.9 and 269.4. At this level of computation, the estimated cost of an attack is less than one hundred thousand dollars, which is quite affordable for intelligence agencies and large corporations. In comparison, searching for a regular collision requires approximately 264.7 operations.<\/p>\n<p>V <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46091\">eelmisel<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/shattered.it\/\">demonstraatsiooni<\/a><\/noindex>  Google'i v\u00f5imalused genereerida erinevaid PDF-faile, millel on sama SHA-1 r\u00e4si <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46102\">kasutatud<\/a><\/noindex> kahe dokumendi \u00fchte faili \u00fchendamise nipp, n\u00e4htava kihi vahetamise ja kihi valikute m\u00e4rgistuse nihutamise kaudu kokkup\u00f5rkealasse. Ressursside l\u00e4hedaste kulude korral (SHA-1 esimese kokkup\u00f5rke leidmiseks kulutas Google aasta arvutusi 110 GPU klastris) v\u00f5imaldab uus meetod saavutada SHA-1 \u00fchtsuse kahe suvalise andmestiku seas. Praktiliselt on v\u00f5imalik ette valmistada TLS-sertifikaate, kus mainitakse erinevaid domeene, kuid SHA-1 hash-id kattuvad. Selline v\u00f5imalus lubab pahatahtlikul sertifitseerimisasutusel luua sertifikaadi digitaalallkirjale, mida saab kasutada vale sertifikaatide autoriseerimiseks suvaliste domeenide suhtes. Probleemi saab kasutada ka protokollide kompromiteerimiseks, mis toetuvad kokkup\u00f5rgete puudumisele, n\u00e4iteks TLS, SSH ja IPsec.<\/p>\n<p>Pakutud eeliste leidmise strateegia koliiside jaoks h\u00f5lmab arvutuste jagamist kaheks etapiks. Esimeses etapis otsitakse piiril olevaid plokke, paigutades juhuslikud muutuja ahelad eelnevalt m\u00e4\u00e4ratud sihtmooduste erinevuste komplekti. Teises etapis v\u00f5rreldakse plokkide tasandil saadud erinevahelad koonusv\u00f5imet, kasutades traditsiooniliste koliisiv\u00f5tete meetodeid. <\/p>\n<p>Kuigi SHA-1 r\u00fcnnaku teoreetiline v\u00f5imalus t\u00f5estati juba 2005. aastal ja praktikas oli esimene koliis <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46091\">leidmine<\/a><\/noindex> 2017. aastal, j\u00e4\u00e4b SHA-1 endiselt kasutusse ning katab mitmeid standardeid ja tehnoloogiaid (nt TLS 1.2, Git jne). T\u00f6\u00f6 peamine eesm\u00e4rk oli anda veel \u00fcks kaalukas argument SHA-1 kasutamise viivitamatuks l\u00f5petamiseks, eriti sertifikaatides ja digitaalsetes allkirjades.<\/p>\n<p>Lisaks saab m\u00e4rkida <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2019\/474\">v\u00e4ljaandmine<\/a><\/noindex> <noindex>tulemused<\/noindex> plokk\u0161ifrite kr\u00fcptoanal\u00fc\u00fcsist <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Simon_(cipher)\">SIMON-32\/64<\/a><\/noindex>, USA NSA poolt v\u00e4lja t\u00f6\u00f6tatud ja 2018. aastal standardina heaks kiidetud <noindex><a rel=\"nofollow\" href=\"https:\/\/www.iso.org\/ru\/standard\/70388.html\">ISO\/IEC 29167-21:2018<\/a><\/noindex>.<br \/>\nUurijatel \u00f5nnestus v\u00e4lja t\u00f6\u00f6tada meetod privaatv\u00f5tme taastamiseks, tuginedes kahele tuntud paarile avatud tekstist ja kr\u00fcpteeritud tekstist. Piiratud arvutusressursside korral v\u00f5tavad v\u00f5tme leidmine aega mitmest tunnist mitme p\u00e4evani. Teoreetiline r\u00fcnnaku edukuse koefitsient on hinnatud 0,25, praktiline olemasoleva protot\u00fc\u00fcbi jaoks aga 0,025.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50674\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0444\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u043e\u0433\u043e \u0433\u043e\u0441\u0443\u0434\u0430\u0440\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u0438\u043d\u0441\u0442\u0438\u0442\u0443\u0442\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0439 \u0432 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0435 \u0438 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u043a\u0435 (INRIA) \u0438 \u041d\u0430\u043d\u044c\u044f\u043d\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0421\u0438\u043d\u0433\u0430\u043f\u0443\u0440) \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043b\u0438 \u0443\u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c SHA-1, \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u0443\u043f\u0440\u043e\u0449\u0430\u044e\u0449\u0438\u0439 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0434\u0432\u0443\u0445 \u0440\u0430\u0437\u043d\u044b\u0445 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u043e\u0432 \u0441 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u043c\u0438 \u0445\u044d\u0448\u0430\u043c\u0438 SHA-1. \u0421\u0443\u0442\u044c \u043c\u0435\u0442\u043e\u0434\u0430 \u0432 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u043f\u043e\u043b\u043d\u043e\u0446\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u043e\u0434\u0431\u043e\u0440\u0430 \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u0438 \u0432 SHA-1 \u043a \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u043e\u043d\u043d\u043e\u0439 \u0430\u0442\u0430\u043a\u0435 \u0441 \u0437\u0430\u0434\u0430\u043d\u043d\u044b\u043c \u043f\u0440\u0435\u0444\u0438\u043a\u0441\u043e\u043c, \u043f\u0440\u0438 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u044f \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u0435\u0442 \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 [&hellip;]<\/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-33517","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u0444\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u043e\u0433\u043e \u0433\u043e\u0441\u0443\u0434\u0430\u0440\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u0438\u043d\u0441\u0442\u0438\u0442\u0443\u0442\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0439 \u0432 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0442\u0438\u043a\u0435 \u0438 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