{"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\/sq\/blog\/novosti-interneta\/predstavlen-bolee-effektivnyj-metod-opredeleniya-prefiksov-kollizij-dlya-sha-1","title":{"rendered":"Shtrohet nj\u00eb metod\u00eb m\u00eb efikase p\u00ebr t\u00eb p\u00ebrcaktuar prefikset e kolizionit p\u00ebr SHA-1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>K\u00ebrkuesit nga instituti komb\u00ebtar i k\u00ebrkimeve n\u00eb informatik\u00eb dhe automatizim (INRIA) n\u00eb Franc\u00eb dhe Universiteti Teknologjik Nanyang (Singapor) <noindex><a rel=\"nofollow\" href=\"https:\/\/mailarchive.ietf.org\/arch\/msg\/cfrg\/NhiGvOFzcEw108YLwF_ndyfB1k4\">kan\u00eb zhvilluar<\/a><\/noindex> nj\u00eb metod\u00eb t\u00eb avancuar <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2019\/459\">metode<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2019\/459.pdf\">t\u00eb sulmit<\/a><\/noindex> n\u00eb algoritmin SHA-1, duke e thjesht\u00ebsuar ndjesh\u00ebm krijimin e dy dokumenteve t\u00eb ndryshme me hash-e SHA-1 t\u00eb nj\u00ebjt\u00eb. Thelbi i metod\u00ebs \u00ebsht\u00eb t\u00eb reduktoj\u00eb operacionin e p\u00ebrputhjes s\u00eb plot\u00eb t\u00eb kolizionit n\u00eb SHA-1 n\u00eb <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\">sulm kolizioni me nj\u00eb prefiks t\u00eb dh\u00ebn\u00eb<\/a><\/noindex>, n\u00eb t\u00eb cil\u00ebn ndodhin kolizionet kur ka disa prefiks t\u00eb caktuar, pavar\u00ebsisht nga t\u00eb dh\u00ebnat e tjera n\u00eb grup. N\u00eb fjal\u00eb t\u00eb tjera, \u00ebsht\u00eb e mundur t\u00eb llogariten dy prefiks t\u00eb paracaktuar dhe n\u00ebse nj\u00ebri bashk\u00ebngjitet me nj\u00eb dokument, nd\u00ebrsa tjetri me t\u00eb dytin \u2014 hash-at rezultuese SHA-1 p\u00ebr k\u00ebto skedar\u00eb do t\u00eb jen\u00eb t\u00eb nj\u00ebjta.<\/p>\n<p>Ky\u00e7i p\u00ebr k\u00ebt\u00eb lloj sulmi ende k\u00ebrkon nj\u00eb sasi t\u00eb madhe llogaritjesh dhe gjetja e prefikseve mbetet m\u00eb e v\u00ebshtir\u00eb se gjetja e zakonshme e kolizionit, por efektiviteti praktik i rezultatit \u00ebsht\u00eb shum\u00eb m\u00eb i lart\u00eb. N\u00ebse deri tani metoda m\u00eb e shpejt\u00eb p\u00ebr t\u00eb k\u00ebrkuar prefikse kolizioni n\u00eb SHA-1 ka k\u00ebrkuar 277.1 operacione, metoda e re e ul numrin e llogaritjeve n\u00eb nj\u00eb gam\u00eb prej 266.9 deri n\u00eb 269.4. N\u00eb k\u00ebt\u00eb nivel llogaritjesh, kostoja e orientuar e sulmit \u00ebsht\u00eb m\u00eb pak se nj\u00ebqind mij\u00eb dollar\u00eb, e cila \u00ebsht\u00eb krejt e arsyeshme p\u00ebr sh\u00ebrbimet sekrete dhe korporatat e m\u00ebdha. P\u00ebr krahasim, p\u00ebr t\u00eb k\u00ebrkuar nj\u00eb kolizion t\u00eb zakonsh\u00ebm \u00ebsht\u00eb e nevojshme t\u00eb kryhen rreth 264.7 operacione.<\/p>\n<p>N\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46091\">t\u00eb kaluar\u00ebs<\/a><\/noindex> <noindex><a rel=\"nofollow\" href=\"https:\/\/shattered.it\/\">demonstrimeve<\/a><\/noindex>  mund\u00ebsit\u00eb e Google p\u00ebr t\u00eb gjeneruar PDF t\u00eb ndrysh\u00ebm me t\u00eb nj\u00ebjtin hash SHA-1 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46102\">u p\u00ebrdor<\/a><\/noindex> truku q\u00eb bashkon n\u00eb nj\u00eb skedar dy dokumente, duke ndryshuar nj\u00eb kat t\u00eb duksh\u00ebm dhe duke zhvendosur etiket\u00ebn e zgjedhjes s\u00eb katit n\u00eb zon\u00ebn e shfaqjes s\u00eb kolizionit. Duke pasur n\u00eb konsiderat\u00eb shpenzime t\u00eb af\u00ebrta burimesh (p\u00ebr t\u00eb gjetur kolizionin e par\u00eb, SHA-1 Google harxhoi nj\u00eb vit llogaritjesh n\u00eb nj\u00eb grumbull me 110 GPU), metodi i ri lejon t\u00eb arrihet p\u00ebrputhja e SHA-1 p\u00ebr dy grupe t\u00eb rast\u00ebsishme t\u00eb dh\u00ebnash. Nga nj\u00eb aspekt praktik, \u00ebsht\u00eb e mundur t\u00eb p\u00ebrgatiten certifikata TLS q\u00eb p\u00ebrfshijn\u00eb dominime t\u00eb ndryshme, por q\u00eb kan\u00eb hash-e SHA-1 t\u00eb nj\u00ebjta. Kjo mund\u00ebsi lejon nj\u00eb autoritet t\u00eb besuesh\u00ebm t\u00eb paqart\u00eb t\u00eb krijoj\u00eb nj\u00eb certifikat\u00eb p\u00ebr nj\u00eb n\u00ebnshkrim digjital, e cila mund t\u00eb p\u00ebrdoret p\u00ebr autorizimin e certifikatave t\u00eb falsifikuara p\u00ebr dominime t\u00eb rast\u00ebsishme. Problemi gjithashtu mund t\u00eb p\u00ebrdoret p\u00ebr t\u00eb komprometuar protokollet q\u00eb mb\u00ebshteten n\u00eb munges\u00ebn e kolizioneve, si TLS, SSH dhe IPsec.<\/p>\n<p>Strategjia e propozuar p\u00ebr k\u00ebrkimin e prefikseve p\u00ebr kolizionin parashikon ndarjen e llogaritjeve n\u00eb dy faza. N\u00eb faz\u00ebn e par\u00eb, ndiqen blloqet q\u00eb jan\u00eb n\u00eb prag t\u00eb kolizionit duke p\u00ebrfshir\u00eb variabla t\u00eb rast\u00ebsish\u00ebm n\u00eb nj\u00eb grup t\u00eb paracaktuar t\u00eb ndryshimeve. N\u00eb faz\u00ebn e dyt\u00eb, n\u00eb nivelin e blloqeve individuale, zinxhir\u00ebt e marr\u00eb t\u00eb ndryshimeve krahasohen me \u00e7iftet e gjendjeve q\u00eb \u00e7ojn\u00eb n\u00eb kolizione, duke p\u00ebrdorur metoda tradicionale t\u00eb sulmeve t\u00eb zbukurimit t\u00eb kolizioneve. <\/p>\n<p>Megjith\u00ebse mund\u00ebsia teorike e sulmit ndaj SHA-1 \u00ebsht\u00eb provuar q\u00eb nga viti 2005, dhe n\u00eb praktik\u00eb kolizioni i par\u00eb u <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46091\">korrigjua<\/a><\/noindex> n\u00eb vitin 2017, SHA-1 ende mbetet n\u00eb p\u00ebrdorim dhe p\u00ebrfshihet n\u00eb disa standarde dhe teknologji (TLS 1.2, Git, etj.). Q\u00ebllimi kryesor i pun\u00ebs s\u00eb kryer ishte d\u00ebshira p\u00ebr t\u00eb ofruar nj\u00eb tjet\u00ebr argument t\u00eb fort\u00eb p\u00ebr ndalimin e menj\u00ebhersh\u00ebm t\u00eb p\u00ebrdorimit t\u00eb SHA-1, ve\u00e7an\u00ebrisht n\u00eb certifikata dhe n\u00ebnshkrime digjitale.<\/p>\n<p>P\u00ebr m\u00eb tep\u00ebr, mund t\u00eb theksohet <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2019\/474\">publikimi<\/a><\/noindex> <noindex>rezultatet<\/noindex> kryptoanaliz\u00ebs s\u00eb algoritmeve bllokues <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Simon_(cipher)\">SIMON-32\/64<\/a><\/noindex>, t\u00eb zhvilluara nga NSA e SHBA-s\u00eb dhe miratuar n\u00eb vitin 2018 si standard <noindex><a rel=\"nofollow\" href=\"https:\/\/www.iso.org\/ru\/standard\/70388.html\">ISO\/IEC 29167-21:2018<\/a><\/noindex>.<br \/>\nK\u00ebrkuesit arrit\u00ebn t\u00eb zhvillojn\u00eb nj\u00eb metod\u00eb p\u00ebr rikuperimin e \u00e7el\u00ebsit t\u00eb mbyllur bazuar n\u00eb dy \u00e7ifte t\u00eb njohura t\u00eb tekstit t\u00eb hapur dhe teksteve t\u00eb enkriptuara. Me burime t\u00eb kufizuara kompjuterike, nevojiten nga disa or\u00eb deri n\u00eb disa dit\u00eb p\u00ebr t\u00eb zbuluar \u00e7el\u00ebsin. Koeficienti teorik i suksesit t\u00eb sulmit \u00ebsht\u00eb vler\u00ebsuar n\u00eb 0.25, nd\u00ebrsa ai praktik p\u00ebr prototipin ekzistues \u00ebsht\u00eb 0.025.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Burimi: <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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