{"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\/hu\/blog\/news\/vypusk-etalonnoj-realizaczii-kriptograficheskoj-hesh-funkczii-blake3-1-0","title":{"rendered":"Megjelent a BLAKE3 1.0 kriptogr\u00e1fiai hash-funkci\u00f3 referencia-implement\u00e1ci\u00f3ja","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Megjelent a BLAKE3 1.0 referenciab implementationja, amely kiemelked\u0151en magas hash sz\u00e1m\u00edt\u00e1si teljes\u00edtm\u00e9nnyel b\u00fcszk\u00e9lkedhet, mik\u00f6zben megb\u00edzhat\u00f3s\u00e1g\u00e1t a SHA-3 szintj\u00e9n tartja. Egy 16 KB m\u00e9ret\u0171 f\u00e1jl hash-gener\u00e1l\u00e1s\u00e1nak tesztje sor\u00e1n a BLAKE3, 256 bites kulccsal, 17-szer gyorsabb a SHA3-256-n\u00e1l, 14-szer a SHA-256-n\u00e1l, 9-szer a SHA-512-n\u00e9l, 6-szor a SHA-1-n\u00e9l, \u00e9s 5-sz\u00f6r a BLAKE2b-n\u00e9l. A jelent\u0151s el\u0151ny megmarad nagy adathalmazok feldolgoz\u00e1sa sor\u00e1n is, p\u00e9ld\u00e1ul a BLAKE3 8-szor gyorsabb a SHA-256-n\u00e1l 1 GB v\u00e9letlenszer\u0171 adat hash-el\u00e9sekor. A BLAKE3 referenciab implementation k\u00f3dja C \u00e9s Rust nyelveken \u00e9rhet\u0151 el, kett\u0151s licenc alatt - k\u00f6zkinccs\u00e9 (CC0) \u00e9s Apache 2.0.      <center><img decoding=\"async\" alt=\"Megjelent a BLAKE3 1.0 kriptogr\u00e1fiai hash-funkci\u00f3 referencia-implement\u00e1ci\u00f3ja\" src=\"\/wp-content\/uploads\/2021\/07\/1fcd18de882eafe2ddc0858bb41856d0.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>          <\/p>\n<p>A hash-f\u00fcggv\u00e9ny olyan alkalmaz\u00e1sokra k\u00e9sz\u00fclt, mint a f\u00e1jlok integrit\u00e1s\u00e1nak ellen\u0151rz\u00e9se, \u00fczenetek hiteles\u00edt\u00e9se \u00e9s adatok gener\u00e1l\u00e1sa kriptogr\u00e1fiai digit\u00e1lis al\u00e1\u00edr\u00e1sok sz\u00e1m\u00e1ra. A BLAKE3 nem alkalmas jelszavak hash-el\u00e9s\u00e9re, mivel a gyors hash-gener\u00e1l\u00e1sra \u00f6sszpontos\u00edt (jelszavakhoz aj\u00e1nlott lass\u00fa hash-f\u00fcggv\u00e9nyeket haszn\u00e1lni, mint a yescrypt, bcrypt, scrypt vagy Argon2). A vizsg\u00e1lt hash-f\u00fcggv\u00e9ny nem \u00e9rz\u00e9keny a hash-elt adatok m\u00e9ret\u00e9re \u00e9s v\u00e9dett a koll\u00edzi\u00f3s t\u00e1mad\u00e1sok \u00e9s az el\u0151k\u00e9p megtal\u00e1l\u00e1s\u00e1val szemben.       <\/p>\n<p>A algoritmust neves kriptogr\u00e1fusok (Jack O\u2019Connor, Jean-Philippe Aumasson, Samuel Neves, Zooko Wilcox-O'Hearn) fejlesztett\u00e9k ki, \u00e9s a BLAKE2 algoritmus folytat\u00e1sak\u00e9nt a blokkl\u00e1ncok f\u00e1jlszerkezet\u00e9hez a Bao mechanizmus\u00e1t alkalmazza. A BLAKE2-vel (BLAKE2b, BLAKE2s) ellent\u00e9tben a BLAKE3 egyetlen algoritmust k\u00edn\u00e1l minden platformra, f\u00fcggetlen\u00fcl a bitm\u00e9rett\u0151l \u00e9s a hash m\u00e9ret\u00e9t\u0151l.     <\/p>\n<p>A teljes\u00edtm\u00e9nyjavul\u00e1st a kerekek sz\u00e1m\u00e1nak cs\u00f6kkent\u00e9s\u00e9vel \u00e9rt\u00e9k el 10-r\u0151l 7-re, \u00e9s a blokkok 1 KB-os darabokban val\u00f3 k\u00fcl\u00f6n hash-el\u00e9s\u00e9vel. A k\u00e9sz\u00edt\u0151k nyilatkozata szerint meggy\u0151z\u0151 matematikai bizony\u00edt\u00e9kot tal\u00e1ltak arra, hogy a megb\u00edzhat\u00f3s\u00e1g fenntart\u00e1sa mellett elegend\u0151 7 k\u00f6rt alkalmazni a 10 helyett (a gy\u00fcm\u00f6lcs\u00f6k turmixol\u00e1s\u00e1hoz hasonl\u00f3an - 7 m\u00e1sodperc eltelt\u00e9vel a gy\u00fcm\u00f6lcs\u00f6k m\u00e1r teljesen el vannak turmixolva, \u00e9s a tov\u00e1bbi 3 m\u00e1sodperc nem befoly\u00e1solja a kever\u00e9k konzisztenci\u00e1j\u00e1t). Mindazon\u00e1ltal n\u00e9h\u00e1ny kutat\u00f3 k\u00e9ts\u00e9geit fejezi ki, arra hivatkozva, hogy noha jelenleg elegend\u0151nek t\u0171nik a 7 k\u00f6r a bemutatott hash t\u00e1mad\u00e1sok ellen, a tov\u00e1bbi 3 k\u00f6r el\u0151ny\u00f6s lehet \u00faj t\u00e1mad\u00e1sok felismer\u00e9se eset\u00e9n a j\u00f6v\u0151ben.     <\/p>\n<p>A blokkokra bont\u00e1s tekintet\u00e9ben a BLAKE3 folyamat 1 KB m\u00e9ret\u0171 darabokra osztja a streamet, \u00e9s minden darabot f\u00fcggetlen\u00fcl hash-el. A darabok hash-jei alapj\u00e1n egy nagyobb hash k\u00e9pz\u0151dik Merkle-binaf\u00e1r\u00f3l. Ez a feloszt\u00e1s megoldja az adatok p\u00e1rhuzamos feldolgoz\u00e1s\u00e1nak probl\u00e9m\u00e1j\u00e1t a hash sz\u00e1m\u00edt\u00e1sakor &#8212; p\u00e9ld\u00e1ul 4 sz\u00e1las SIMD utas\u00edt\u00e1sokat haszn\u00e1lhatunk 4 blokk hash-einek egyidej\u0171 sz\u00e1m\u00edt\u00e1s\u00e1ra. A hagyom\u00e1nyos SHA-* hash-funkci\u00f3k sorban dolgozz\u00e1k fel az adatokat.         <\/p>\n<p>A BLAKE3 jellemz\u0151i:  <\/p>\n<ul>\n<li class=\"l\"> Magas teljes\u00edtm\u00e9ny, a BLAKE3 jelent\u0151sen gyorsabb, mint az MD5, SHA-1, SHA-2, SHA-3 \u00e9s BLAKE2.  <\/li>\n<li class=\"l\"> Biztons\u00e1g, bele\u00e9rtve az \u00fczenet hosszabb\u00edt\u00e1s\u00e1nak ellen\u00e1ll\u00e1s\u00e1t, amelynek a SHA-2 ki van t\u00e9ve;\n<li class=\"l\"> El\u00e9rhet\u0151k Rust nyelv\u0171 v\u00e1ltozatok, amelyek optimaliz\u00e1ltak az SSE2, SSE4.1, AVX2, AVX-512 \u00e9s NEON utas\u00edt\u00e1sok haszn\u00e1lat\u00e1ra.    <\/li>\n<li class=\"l\"> A sz\u00e1m\u00edt\u00e1sok p\u00e1rhuzamos\u00edt\u00e1sa b\u00e1rmilyen sz\u00e1m\u00fa sz\u00e1l \u00e9s SIMD-csatorna sz\u00e1m\u00e1ra.     <\/li>\n<li class=\"l\"> Lehet\u0151s\u00e9g inkrement\u00e1lis friss\u00edt\u00e9sre \u00e9s \u00e9rv\u00e9nyes\u00edtett adatfolyamok feldolgoz\u00e1s\u00e1ra;  <\/li>\n<li class=\"l\"> Haszn\u00e1lat PRF, MAC, KDF, XOF \u00e9s hagyom\u00e1nyos hash m\u00f3dban;  <\/li>\n<li class=\"l\"> Egys\u00e9ges algoritmus minden architekt\u00far\u00e1hoz, gyorsan m\u0171k\u00f6dik x86-64 rendszereken \u00e9s 32 bites ARM processzorokon is.    <\/li>\n<\/ul>\n<p>A BLAKE3 f\u0151bb k\u00fcl\u00f6nbs\u00e9gei a BLAKE2-h\u00f6z k\u00e9pest:  <\/p>\n<ul>\n<li class=\"l\"> Binaris fastrukt\u00fara haszn\u00e1lata, amely lehet\u0151v\u00e9 teszi a hash sz\u00e1m\u00edt\u00e1s\u00e1nak korl\u00e1tlan p\u00e1rhuzamoss\u00e1g\u00e1t.  <\/li>\n<li class=\"l\"> A k\u00f6r\u00f6k sz\u00e1m\u00e1nak cs\u00f6kkent\u00e9se 10-r\u0151l 7-re.    <\/li>\n<li class=\"l\"> H\u00e1rom m\u0171k\u00f6d\u00e9si m\u00f3d: hash-el\u00e9s, kulccsal t\u00f6rt\u00e9n\u0151 hash-el\u00e9s (HMAC) \u00e9s kulcs l\u00e9trehoz\u00e1sa (KDF).    <\/li>\n<li class=\"l\"> A kieg\u00e9sz\u00edt\u0151 k\u00f6lts\u00e9gek hi\u00e1nya a kulcsos hasheln\u00e9l, a kulcsparam\u00e9ter-ablak \u00e1ltal kor\u00e1bban elfoglalt ter\u00fclet kihaszn\u00e1l\u00e1s\u00e1val.  <\/li>\n<li class=\"l\"> A be\u00e9p\u00edtett mechanizmus funkci\u00f3 form\u00e1j\u00e1ban, kiterjeszthet\u0151 eredm\u00e9nnyel (XOF, Extendable Output Function), amely lehet\u0151v\u00e9 teszi a p\u00e1rhuzamos feldolgoz\u00e1st \u00e9s a pozicion\u00e1l\u00e1st (seek).    <\/li>\n<\/ul>\n<p>Forr\u00e1s: <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 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