{"id":54924,"date":"2020-01-08T00:00:00","date_gmt":"2020-01-07T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/predlozhen-metod-opredeleniya-kollizij-v-sha-1-prigodnyj-dlya-ataki-na-pgp"},"modified":"2020-02-18T14:02:59","modified_gmt":"2020-02-18T11:02:59","slug":"predlozhen-metod-opredeleniya-kollizij-v-sha-1-prigodnyj-dlya-ataki-na-pgp","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/predlozhen-metod-opredeleniya-kollizij-v-sha-1-prigodnyj-dlya-ataki-na-pgp","title":{"rendered":"Predlo\u017een je na\u010din za odre\u0111ivanje kolizija u SHA-1, prikladan za napad na PGP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Istra\u017eiva\u010di iz francuskog dr\u017eavnog instituta za istra\u017eivanje u informatici i automatizaciji (INRIA) i Nanyang Tehnolo\u0161kog Sveu\u010dili\u0161ta (Singapur) predstavili su metodu napada <noindex><a rel=\"nofollow\" href=\"https:\/\/sha-mbles.github.io\/\">Haos<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2020\/014.pdf\">PDF<\/a><\/noindex>), koja se prikazuje kao prva prakti\u010dna implementacija napada na SHA-1 algoritam, koju je mogu\u0107e iskoristiti za stvaranje la\u017enih digitalnih potpisa PGP i GnuPG. Istra\u017eiva\u010di vjeruju da se sada svi prakti\u010dni napadi na MD5 mogu primijeniti i na SHA-1, iako jo\u0161 uvijek zahtijevaju zna\u010dajne resurse za izvr\u0161enje.<\/p>\n<p>Metoda se temelji na provo\u0111enju <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\">kolizionog napada sa zadanom prefiksom<\/a><\/noindex>, koja omogu\u0107ava pronala\u017eenje dodataka za dva proizvoljna skupa podataka, pri \u010demu \u0107e se prisustvom tih dodataka do\u0107i do kolizionih skupova, \u010dija primjena SHA-1 algoritma \u0107e rezultirati istim hash-om. Drugim rije\u010dima, mogu\u0107e je izra\u010dunati dva dodatka za dva postoje\u0107a dokumenta, a ako se jedan pridoda prvom dokumentu, a drugi drugom \u2014 rezultantni SHA-1 hash za ova dva fajla bit \u0107e isti.<\/p>\n<p>Nova metoda se razlikuje od ranije predlo\u017eenih sli\u010dnih tehnika pove\u0107anjem u\u010dinkovitosti pretra\u017eivanja kolizije i demonstracijom prakti\u010dne primjene za napad na PGP. Konkretno, istra\u017eiva\u010di su uspjeli pripremiti dva otvorena PGP-klju\u010dna para razli\u010ditih veli\u010dina (RSA-8192 i RSA-6144) s razli\u010ditim identifikatorima korisnika i certifikatima koji uzrokuju koliziju SHA-1. <noindex><a rel=\"nofollow\" href=\"https:\/\/sha-mbles.github.io\/bob.asc\">Prvi klju\u010d<\/a><\/noindex> uklju\u010divao je identifikator \u017ertve, dok je <noindex><a rel=\"nofollow\" href=\"https:\/\/sha-mbles.github.io\/alice.asc\">drugi klju\u010d<\/a><\/noindex> uklju\u010divao ime i sliku napada\u010da. Pri tome, zahvaljuju\u0107i pronala\u017eenju kolizije, identifikacijski certifikat koji uklju\u010duje klju\u010d i sliku napada\u010da imao je isti SHA-1 he\u0161 kao i identifikacijski certifikat koji uklju\u010duje klju\u010d i ime \u017ertve. <\/p>\n<p>Napada\u010d je mogao zatra\u017eiti digitalni potpis za svoj klju\u010d i sliku od vanjskog certifikacijskog tijela, nakon \u010dega je mogao prenijeti digitalni potpis na klju\u010d \u017ertve. Digitalni potpis ostaje valjan zbog kolizije i ovjeravanja klju\u010da napada\u010da od strane certifikacijskog tijela, \u0161to napada\u010du omogu\u0107ava preuzimanje kontrole i nad klju\u010dem s imenom \u017ertve (budu\u0107i da se SHA-1 he\u0161 za oba klju\u010da poklapa). Na kraju, napada\u010d se mo\u017ee predstavljati kao \u017ertva i potpisati bilo koji dokument u njezino ime.<\/p>\n<p>Napad je trenutno jo\u0161 uvijek prili\u010dno skup, ali je ve\u0107 dovoljno pristupa\u010dan za obavje\u0161tajne agencije i velike korporacije. Za jednostavno pronala\u017eenje kolizije kori\u0161tenjem jeftinijeg GPU-a NVIDIA GTX 970, tro\u0161kovi su iznosili 11 tisu\u0107a dolara, dok su tro\u0161kovi pronala\u017eenja kolizije s odre\u0111enim prefiksom iznosili 45 tisu\u0107a dolara (za usporedbu, 2012. godine procijenjeni tro\u0161kovi pronala\u017eenja kolizije u SHA-1 iznosili su 2 milijuna dolara, a 2015. godine 700 tisu\u0107a). Za izvr\u0161enje prakti\u010dnog napada na PGP bilo je potrebno dva mjeseca izra\u010duna uz kori\u0161tenje 900 GPU-a NVIDIA GTX 1060, \u010dija je najam istra\u017eiva\u010de ko\u0161tao 75 tisu\u0107a dolara.<\/p>\n<p>Predlo\u017eena metoda otkrivanja kolizija od strane istra\u017eiva\u010da je otprilike 10 puta efikasnija od prethodnih dostignu\u0107a \u2014 nivo slo\u017eenosti izra\u010dunavanja kolizije smanjen je na 261.2 operacija, umjesto 264.7, dok je slo\u017eenost kolizije s odre\u0111enim prefiksom smanjena na 263.4 operacija umjesto 267.1. Istra\u017eiva\u010di preporu\u010duju \u0161to br\u017ei prelazak sa SHA-1 na kori\u0161tenje SHA-256 ili SHA-3, jer prema njihovim prognozama, do 2025. godine tro\u0161kovi napada \u0107e pasti na 10 tisu\u0107a dolara.<\/p>\n<p>Razvojni tim GnuPG-a je o problemu obavije\u0161ten 1. oktobra (CVE-2019-14855) i 25. novembra, u izdanju GnuPG 2.2.18, preduzeli su mjere za blokiranje problemati\u010dnih certifikata \u2014 svi digitalni identifikacijski potpisi SHA-1, izra\u0111eni nakon 19. januara pro\u0161le godine, sada se smatraju neispravnim. U CAcert-u, jednom od glavnih sertifikacijskih centara za PGP klju\u010deve, planiraju pre\u0107i na kori\u0161tenje sigurnijih hash funkcija za certifikaciju klju\u010deva. Razvojni tim OpenSSL-a, kao odgovor na informacije o novoj metodi napada, odlu\u010dio je onemogu\u0107iti SHA-1 na predlo\u017eenom defaultnom prvom nivou sigurnosti (SHA-1 se ne mo\u017ee koristiti za certifikate i digitalne potpise u procesu pregovaranja vezanih za konekcije).<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Izvor: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52149\">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) \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 Shambles (PDF), \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u0435\u043f\u043e\u0434\u043d\u043e\u0441\u0438\u0442\u0441\u044f \u043a\u0430\u043a \u043f\u0435\u0440\u0432\u0430\u044f \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c SHA-1, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0444\u0438\u043a\u0442\u0438\u0432\u043d\u044b\u0445 \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439 PGP \u0438 GnuPG. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u043f\u043e\u043b\u0430\u0433\u0430\u044e\u0442, \u0447\u0442\u043e \u0442\u0435\u043f\u0435\u043f\u0440\u044c \u0432\u0441\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0430\u0442\u0430\u043a\u0438 \u043d\u0430 MD5 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u0438 \u0434\u043b\u044f [&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-54924","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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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