{"id":100856,"date":"2021-07-26T22:22:38","date_gmt":"2021-07-26T20:22:38","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-etalonnoj-realizaczii-kriptograficheskoj-hesh-funkczii-blake3-1-0"},"modified":"2021-07-26T22:22:38","modified_gmt":"2021-07-26T20:22:38","slug":"vypusk-etalonnoj-realizaczii-kriptograficheskoj-hesh-funkczii-blake3-1-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/vypusk-etalonnoj-realizaczii-kriptograficheskoj-hesh-funkczii-blake3-1-0","title":{"rendered":"Vyd\u00e1n\u00ed referen\u010dn\u00ed implementace kryptografick\u00e9 hash funkce BLAKE3 1.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Byla vyd\u00e1na referen\u010dn\u00ed implementace kryptografick\u00e9 hashovac\u00ed funkce BLAKE3 1.0, kter\u00e1 se vyzna\u010duje velmi vysok\u00fdm v\u00fdkonem v\u00fdpo\u010dtu hashe p\u0159i zaji\u0161t\u011bn\u00ed spolehlivosti na \u00farovni SHA-3. V testu generov\u00e1n\u00ed hashe pro soubor o velikosti 16 KB p\u0159ekon\u00e1v\u00e1 BLAKE3 se 256bitov\u00fdm kl\u00ed\u010dem SHA3-256 v 17n\u00e1sobku, SHA-256 \u2013 v 14n\u00e1sobku, SHA-512 \u2013 v 9n\u00e1sobku, SHA-1 \u2013 v 6n\u00e1sobku a BLAKE2b \u2013 v 5n\u00e1sobku. V\u00fdznamn\u00fd n\u00e1skok p\u0159etrv\u00e1v\u00e1 i p\u0159i zpracov\u00e1n\u00ed velmi velk\u00fdch objem\u016f dat, nap\u0159\u00edklad BLAKE3 byl rychlej\u0161\u00ed ne\u017e SHA-256 8n\u00e1sobn\u011b p\u0159i v\u00fdpo\u010dtu hashe pro 1GB n\u00e1hodn\u00fdch dat. K\u00f3d referen\u010dn\u00ed implementace BLAKE3 je dod\u00e1v\u00e1n v variant\u00e1ch v jazyc\u00edch C a Rust pod dvoj\u00ed licenc\u00ed \u2013 ve\u0159ejn\u00e1 dom\u00e9na (CC0) a Apache 2.0.      <center><img decoding=\"async\" alt=\"Vyd\u00e1n\u00ed referen\u010dn\u00ed implementace kryptografick\u00e9 hash funkce BLAKE3 1.0\" src=\"\/wp-content\/uploads\/2021\/07\/1fcd18de882eafe2ddc0858bb41856d0.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>          <\/p>\n<p>Hash funkce je ur\u010dena pro pou\u017eit\u00ed, jako je kontrola integrity soubor\u016f, autentizace zpr\u00e1v a generov\u00e1n\u00ed dat pro kryptografick\u00e9 digit\u00e1ln\u00ed podpisy. BLAKE3 nen\u00ed ur\u010dena pro hashov\u00e1n\u00ed hesel, proto\u017ee je zam\u011b\u0159ena na co nejrychlej\u0161\u00ed v\u00fdpo\u010det hash\u016f (pro hesla se doporu\u010duje pou\u017e\u00edvat pomal\u00e9 hash funkce jako yescrypt, bcrypt, scrypt nebo Argon2). Zva\u017eovan\u00e1 hash funkce je necitliv\u00e1 na velikost hashovan\u00fdch dat a je chr\u00e1n\u011bna p\u0159ed \u00fatoky zam\u011b\u0159en\u00fdmi na hled\u00e1n\u00ed koliz\u00ed a p\u0159ed preimage \u00fatoky.       <\/p>\n<p>Algoritmus byl vyvinut zn\u00e1m\u00fdmi odborn\u00edky na kryptografii (Jack O\u2019Connor, Jean-Philippe Aumasson, Samuel Neves, Zooko Wilcox-O\u2019Hearn) a d\u00e1le rozv\u00edj\u00ed algoritmus BLAKE2 a pou\u017e\u00edv\u00e1 pro k\u00f3dov\u00e1n\u00ed strom\u016f \u0159et\u011bzc\u016f blok\u016f mechanismus Bao. Na rozd\u00edl od BLAKE2 (BLAKE2b, BLAKE2s) nab\u00edz\u00ed BLAKE3 jednotn\u00fd algoritmus pro v\u0161echny platformy, nez\u00e1visl\u00fd na architektu\u0159e a velikosti hashe.     <\/p>\n<p>Zv\u00fd\u0161en\u00ed v\u00fdkonu se poda\u0159ilo dos\u00e1hnout zkr\u00e1cen\u00edm po\u010dtu kol z 10 na 7 a odd\u011blen\u00fdm hashov\u00e1n\u00edm blok\u016f po 1 KB. Podle tvrzen\u00ed tv\u016frc\u016f na\u0161li p\u0159esv\u011bd\u010div\u00fd matematick\u00fd d\u016fkaz, \u017ee lze dos\u00e1hnout 7 kol m\u00edsto 10 p\u0159i zachov\u00e1n\u00ed stejn\u00e9 \u00farovn\u011b spolehlivosti (pro n\u00e1zornost lze uv\u00e9st p\u0159\u00edklad s mixov\u00e1n\u00edm ovoce v mix\u00e9ru \u2013 po 7 sekund\u00e1ch je ovoce ji\u017e zcela prom\u00edch\u00e1no a dal\u0161\u00edch 3 sekundy nemaj\u00ed vliv na konzistenci sm\u011bsi). P\u0159itom n\u011bkte\u0159\u00ed badatel\u00e9 vyjad\u0159uj\u00ed pochybnosti, domn\u00edvaj\u00edc\u00ed se, \u017ee i kdy\u017e jsou v sou\u010dasnosti 7 kol dostate\u010dn\u00e1 k odol\u00e1v\u00e1n\u00ed v\u0161em zn\u00e1m\u00fdm \u00fatok\u016fm na hashe, mohou b\u00fdt dal\u0161\u00ed 3 kola u\u017eite\u010dn\u00e1 v p\u0159\u00edpad\u011b odhalen\u00ed nov\u00fdch \u00fatok\u016f v budoucnu.     <\/p>\n<p>Pokud jde o rozd\u011blen\u00ed do blok\u016f, BLAKE3 rozd\u011bluje proud na kousky o velikosti 1 kB a ka\u017ed\u00fd kousek je hashov\u00e1n nez\u00e1visle. Na z\u00e1klad\u011b hash\u016f kousk\u016f se pomoc\u00ed bin\u00e1rn\u00edho Merkleova stromu vytv\u00e1\u0159\u00ed jeden velk\u00fd hash. Toto rozd\u011blen\u00ed umo\u017e\u0148uje vy\u0159e\u0161it probl\u00e9m s paralelizac\u00ed zpracov\u00e1n\u00ed dat p\u0159i v\u00fdpo\u010dtu hash\u016f \u2014 nap\u0159\u00edklad je mo\u017en\u00e9 vyu\u017e\u00edt 4-j\u00e1drov\u00e9 SIMD instrukce pro sou\u010dasn\u00fd v\u00fdpo\u010det hash\u016f 4 blok\u016f. Tradi\u010dn\u00ed hashovac\u00ed funkce SHA-* zpracov\u00e1vaj\u00ed data sekven\u010dn\u011b.         <\/p>\n<p>Funkce BLAKE3:  <\/p>\n<ul>\n<li class=\"l\"> Vysok\u00fd v\u00fdkon, BLAKE3 je v\u00fdrazn\u011b rychlej\u0161\u00ed ne\u017e MD5, SHA-1, SHA-2, SHA-3 a BLAKE2.  <\/li>\n<li class=\"l\"> Bezpe\u010dnost, v\u010detn\u011b odolnosti v\u016f\u010di \u00fatoku na prodlu\u017eov\u00e1n\u00ed zpr\u00e1vy, na kter\u00fd je n\u00e1chyln\u00fd SHA-2;\n<li class=\"l\"> K dispozici jsou varianty v jazyce Rust optimalizovan\u00e9 pro pou\u017eit\u00ed instrukc\u00ed SSE2, SSE4.1, AVX2, AVX-512 a NEON.    <\/li>\n<li class=\"l\"> Zaji\u0161t\u011bn\u00ed paralelizace v\u00fdpo\u010dt\u016f na libovoln\u00fd po\u010det vl\u00e1ken a SIMD kan\u00e1l\u016f.     <\/li>\n<li class=\"l\"> Mo\u017enost inkrement\u00e1ln\u00ed aktualizace a ov\u011b\u0159en\u00e9ho zpracov\u00e1n\u00ed proud\u016f;  <\/li>\n<li class=\"l\"> Pou\u017eit\u00ed v re\u017eimech PRF, MAC, KDF, XOF a jako b\u011b\u017en\u00fd hash;  <\/li>\n<li class=\"l\"> Jedin\u00fd algoritmus pro v\u0161echny architektury, rychl\u00fd jak na syst\u00e9mech x86-64, tak na 32-bitov\u00fdch procesorech ARM.    <\/li>\n<\/ul>\n<p>Hlavn\u00ed rozd\u00edly BLAKE3 od BLAKE2:  <\/p>\n<ul>\n<li class=\"l\"> Pou\u017eit\u00ed bin\u00e1rn\u00ed stromov\u00e9 struktury, kter\u00e1 umo\u017e\u0148uje neomezen\u00fd paralelismus p\u0159i v\u00fdpo\u010dtu hashe.  <\/li>\n<li class=\"l\"> Sn\u00ed\u017een\u00ed po\u010dtu kol z 10 na 7.    <\/li>\n<li class=\"l\"> T\u0159i pracovn\u00ed re\u017eimy: hashov\u00e1n\u00ed, hashov\u00e1n\u00ed s kl\u00ed\u010dem (HMAC) a generov\u00e1n\u00ed kl\u00ed\u010de (KDF).    <\/li>\n<li class=\"l\"> Absence dal\u0161\u00edch re\u017eijn\u00edch n\u00e1klad\u016f p\u0159i hashov\u00e1n\u00ed s kl\u00ed\u010dem d\u00edky pou\u017eit\u00ed oblasti, kterou d\u0159\u00edve zab\u00edral blok parametr\u016f kl\u00ed\u010de.  <\/li>\n<li class=\"l\"> Vestav\u011bn\u00fd mechanismus funguj\u00edc\u00ed jako funkce s prodlu\u017eovan\u00fdm v\u00fdstupem (XOF, Extendable Output Function), kter\u00e1 umo\u017e\u0148uje paralelizaci a p\u0159 positioning (seek).    <\/li>\n<\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55549\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0445\u0435\u0448-\u0444\u0443\u043d\u043a\u0446\u0438\u0438 BLAKE3 1.0, \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u043e\u0447\u0435\u043d\u044c \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u044e \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u0445\u0435\u0448\u0430 \u043f\u0440\u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u0438 \u043d\u0430\u0434\u0451\u0436\u043d\u043e\u0441\u0442\u0438 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 SHA-3. \u0412 \u0442\u0435\u0441\u0442\u0435 \u043d\u0430 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e \u0445\u0435\u0448\u0430 \u0434\u043b\u044f \u0444\u0430\u0439\u043b\u0430, \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c 16 \u041a\u0411, BLAKE3 \u0441 256-\u0431\u0438\u0442\u043d\u044b\u043c \u043a\u043b\u044e\u0447\u043e\u043c \u043e\u043f\u0435\u0440\u0435\u0436\u0430\u0435\u0442 SHA3-256 \u0432 17 \u0440\u0430\u0437, SHA-256 &#8212; \u0432 14 \u0440\u0430\u0437, SHA-512 &#8212; \u0432 9 \u0440\u0430\u0437, SHA-1 &#8212; \u0432 6 \u0440\u0430\u0437, \u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100857,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100856","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 \u044d\u0442\u0430\u043b\u043e\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0445\u0435\u0448-\u0444\u0443\u043d\u043a\u0446\u0438\u0438 BLAKE3 1.0, \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0439 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