{"id":55092,"date":"2020-01-12T00:00:00","date_gmt":"2020-01-11T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/dostupna-kriptograficheskaya-hesh-funktsiya-blake3-kotoraya-v-10-raz-bystree-sha-2"},"modified":"2020-02-18T14:03:10","modified_gmt":"2020-02-18T11:03:10","slug":"dostupna-kriptograficheskaya-hesh-funktsiya-blake3-kotoraya-v-10-raz-bystree-sha-2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/dostupna-kriptograficheskaya-hesh-funktsiya-blake3-kotoraya-v-10-raz-bystree-sha-2","title":{"rendered":"Dost\u0119pna jest funkcja skr\u00f3tu kryptograficznego BLAKE3, kt\u00f3ra jest 10 razy szybsza od SHA-2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Opublikowano ostateczn\u0105 wersj\u0119 algorytmu <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/BLAKE3-team\/BLAKE3\">BLAKE3<\/a><\/noindex>, kt\u00f3ry oferuje kryptograficzn\u0105 funkcj\u0119 skr\u00f3tu, zaprojektowan\u0105 do takich zastosowa\u0144 jak weryfikacja integralno\u015bci plik\u00f3w, autoryzacja wiadomo\u015bci i generowanie danych do podpis\u00f3w cyfrowych. BLAKE3 nie jest przeznaczony do haszowania hase\u0142 (do hase\u0142 nale\u017cy u\u017cywa\u0107 yescrypt, bcrypt, scrypt lub Argon2), poniewa\u017c ma na celu maksymalnie szybkie obliczanie skr\u00f3t\u00f3w z gwarancj\u0105 braku kolizji, z ochron\u0105 przed <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%90%D1%82%D0%B0%D0%BA%D0%B0_%D0%BD%D0%B0%D1%85%D0%BE%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F_%D0%BF%D1%80%D0%BE%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D0%B0\">znalezieniem preobrazu<\/a><\/noindex> i nietrudno\u015bci\u0105 wra\u017cliwo\u015bci na wielko\u015b\u0107 haszowanych danych. Referencyjna implementacja BLAKE3 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/BLAKE3-team\/BLAKE3\">opublikowane<\/a><\/noindex> na podw\u00f3jnej licencji \u2014 domena publiczna (CC0) i Apache 2.0.<\/p>\n<p>Kluczow\u0105 r\u00f3\u017cnic\u0105 nowej funkcji haszuj\u0105cej jest bardzo wysoka wydajno\u015b\u0107 obliczania hasha przy zachowaniu niezawodno\u015bci na poziomie SHA-3. Domy\u015blny rozmiar wynikowego hasha w BLAKE3 wynosi 32 bajty (256 bit\u00f3w), ale mo\u017ce by\u0107 powi\u0119kszony do dowolnych warto\u015bci. W te\u015bcie generowania hasha dla pliku o rozmiarze 16 KB, BLAKE3 przewy\u017csza SHA3-256 15-krotnie, SHA-256 \u2014 12-krotnie, SHA-512 \u2014 8-krotnie, SHA-1 \u2014 6-krotnie, a BLAKE2b \u2014 4-krotnie. Znacz\u0105ca przewaga utrzymuje si\u0119 r\u00f3wnie\u017c przy przetwarzaniu bardzo du\u017cych ilo\u015bci danych, na przyk\u0142ad BLAKE3 okaza\u0142 si\u0119 <noindex><a rel=\"nofollow\" href=\"https:\/\/nextjournal.com\/mk\/BLAKE3\">s\u0105 szybsze<\/a><\/noindex> 8 razy szybszy ni\u017c SHA-256 przy obliczaniu skr\u00f3tu dla 1 GB losowych danych.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/pics_base\/0_1578813226.png\"><img decoding=\"async\" alt=\"Dost\u0119pna jest funkcja skr\u00f3tu kryptograficznego BLAKE3, kt\u00f3ra jest 10 razy szybsza od SHA-2\" src=\"\/wp-content\/uploads\/2020\/01\/b9b93630e080b4d6c9d3285d36017966.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Algorytm zosta\u0142 opracowany przez znanych specjalist\u00f3w w dziedzinie kryptografii (<noindex><a rel=\"nofollow\" href=\"https:\/\/iohk.io\/en\/team\/john-oconnor\">Jack O\u2019Connor<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/aumasson.jp\/\">Jean-Philippe Aumasson<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/sevenps?lang=en\">Samuel Neves<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Zooko_Wilcox-O%27Hearn\">Zooko Wilcox-O\u2019Hearn<\/a><\/noindex>) i kontynuuje rozw\u00f3j algorytmu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=35676\">BLAKE2<\/a><\/noindex> i stosuje do kodowania mechanizm drzew blok\u00f3w <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/oconnor663\/bao\/blob\/ae247d2aff286dfe0a31d41b6afc02b263956091\/docs\/spec.md\">Bao<\/a><\/noindex>. W przeciwie\u0144stwie do BLAKE2 (BLAKE2b, BLAKE2s), w BLAKE3 dla wszystkich platform zaproponowano jednolity algorytm, niezwi\u0105zany z bitowo\u015bci\u0105 i rozmiarem skr\u00f3tu. <\/p>\n<p>Wzrost wydajno\u015bci uda\u0142o si\u0119 osi\u0105gn\u0105\u0107 dzi\u0119ki skr\u00f3ceniu liczby rund z 10 do 7 oraz oddzielnemu haszowaniu blok\u00f3w kawa\u0142kami po 1 KB. Zgodnie z zapewnieniami tw\u00f3rc\u00f3w, znale\u017ali przekonuj\u0105ce <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/BLAKE3-team\/BLAKE3-specs\/blob\/master\/blake3.pdf\">dowody<\/a><\/noindex>, \u017ce mo\u017cna si\u0119 oby\u0107 7 rundami zamiast 10 przy zachowaniu tego samego poziomu niezawodno\u015bci (dla zobrazowania mo\u017cna poda\u0107 przyk\u0142ad z mieszaniem owoc\u00f3w w mikserze \u2014 po 7 sekundach owoce s\u0105 ju\u017c ca\u0142kowicie wymieszane, a dodatkowe 3 sekundy nie wp\u0142yn\u0105 na konsystencj\u0119 mieszanki). Przy tym niekt\u00f3rzy badacze wyra\u017caj\u0105 w\u0105tpliwo\u015bci, s\u0105dz\u0105c, \u017ce nawet je\u015bli obecnie 7 rund jest wystarczaj\u0105ce do przeciwdzia\u0142ania wszystkim znanym atakom na hashe, dodatkowe 3 rundy mog\u0105 okaza\u0107 si\u0119 przydatne w przypadku ujawnienia nowych atak\u00f3w w przysz\u0142o\u015bci. <\/p>\n<p>Je\u015bli chodzi o podzia\u0142 na bloki, to w BLAKE3 strumie\u0144 dzieli si\u0119 na kawa\u0142ki o wielko\u015bci 1 KB, a ka\u017cdy kawa\u0142ek jest haszowany niezale\u017cnie. Na podstawie haszy kawa\u0142k\u00f3w na bazie <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%94%D0%B5%D1%80%D0%B5%D0%B2%D0%BE_%D1%85%D0%B5%D1%88%D0%B5%D0%B9\">drzewa binarnego Merkle'a<\/a><\/noindex> powstaje jeden du\u017cy hash. To podzia\u0142 pozwala rozwi\u0105za\u0107 problem z r\u00f3wnoleg\u0142ym przetwarzaniem danych podczas obliczania hasha \u2014 na przyk\u0142ad, mo\u017cna wykorzysta\u0107 4-w\u0105trowe instrukcje SIMD do jednoczesnego obliczania hashy 4 blok\u00f3w. Tradycyjne funkcje haszuj\u0105ce SHA-* przetwarzaj\u0105 dane sekwencyjnie. <\/p>\n<p>Cechy BLAKE3:<\/p>\n<ul>\n<li class=\"l\"> Wysoka wydajno\u015b\u0107;\n<li class=\"l\"> Bezpiecze\u0144stwo, w tym odporno\u015b\u0107 na <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%90%D1%82%D0%B0%D0%BA%D0%B0_%D1%83%D0%B4%D0%BB%D0%B8%D0%BD%D0%B5%D0%BD%D0%B8%D0%B5%D0%BC_%D1%81%D0%BE%D0%BE%D0%B1%D1%89%D0%B5%D0%BD%D0%B8%D1%8F\">atak wyd\u0142u\u017cenia wiadomo\u015bci,<\/a><\/noindex>na kt\u00f3r\u0105 nara\u017cony jest SHA-2;\n<li class=\"l\"> Zapewnienie r\u00f3wnoleg\u0142ego przetwarzania oblicze\u0144 na dowolnej liczbie w\u0105tk\u00f3w i kana\u0142\u00f3w SIMD;\n<li class=\"l\"> Mo\u017cliwo\u015b\u0107 inkrementalnej aktualizacji i weryfikowanej obr\u00f3bki strumieni;\n<li class=\"l\"> Zastosowanie w trybach PRF, MAC, KDF, XOF oraz jako zwyk\u0142y hash;\n<li class=\"l\"> Jednolity algorytm dla wszystkich architektur, szybki zar\u00f3wno w systemach x86-64, jak i na 32-bitowych procesorach ARM.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52173\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u0444\u0438\u043d\u0430\u043b\u044c\u043d\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 BLAKE3, \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u044e\u0449\u0435\u0433\u043e \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0445\u0435\u0448-\u0444\u0443\u043d\u043a\u0446\u0438\u044e, \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u043d\u043d\u0443\u044e \u043d\u0430 \u0442\u0430\u043a\u0438\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f, \u043a\u0430\u043a \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u0438 \u0444\u0430\u0439\u043b\u043e\u0432, \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044f \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u0438 \u0444\u043e\u0440\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u044b\u0445 \u043f\u043e\u0434\u043f\u0438\u0441\u0435\u0439. BLAKE3 \u043d\u0435 \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u0430 \u0434\u043b\u044f \u0445\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0430\u0440\u043e\u043b\u0435\u0439 (\u0434\u043b\u044f \u043f\u0430\u0440\u043e\u043b\u0435\u0439 \u043d\u0443\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c yescrypt, bcrypt, scrypt \u0438\u043b\u0438 Argon2), \u0442\u0430\u043a \u043a\u0430\u043a \u043d\u0430\u0446\u0435\u043b\u0435\u043d\u0430 \u043d\u0430 \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e \u0431\u044b\u0441\u0442\u0440\u043e\u0435 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0435 \u0445\u044d\u0448\u0435\u0439 \u0441 \u0433\u0430\u0440\u0430\u043d\u0442\u0438\u0435\u0439 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u044f \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u0439, \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u043e\u0431\u0440\u0430\u0437\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":55093,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-55092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u0444\u0438\u043d\u0430\u043b\u044c\u043d\u0430\u044f \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 BLAKE3, \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u044e\u0449\u0435\u0433\u043e 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