{"id":102963,"date":"2022-01-14T15:36:46","date_gmt":"2022-01-14T13:36:46","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/%d1%8d%d0%ba%d1%81%d0%bf%d0%b5%d1%80%d0%b8%d0%bc%d0%b5%d0%bd%d1%82-%d0%bf%d0%be-%d1%81%d0%b8%d0%bc%d1%83%d0%bb%d1%8f%d1%86%d0%b8%d0%b8-%d0%bf%d0%be%d0%bb%d0%bd%d0%be%d1%80%d0%b0%d0%b7%d0%bc%d0%b5"},"modified":"2022-01-14T15:36:46","modified_gmt":"2022-01-14T13:36:46","slug":"eksperiment-po-simulyaczii-polnorazme","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/eksperiment-po-simulyaczii-polnorazme","title":{"rendered":"Experiment simulace plnohodnotn\u00e9 s\u00edt\u011b Tor","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci z univerzity Waterloo a V\u00fdzkumn\u00e9 laborato\u0159e n\u00e1mo\u0159nictva USA p\u0159edstavili v\u00fdsledky v\u00fdvoje simul\u00e1toru s\u00edt\u011b Tor, kter\u00fd je po\u010dtem uzl\u016f a u\u017eivatel\u016f srovnateln\u00fd se z\u00e1kladn\u00ed s\u00edt\u00ed Tor a umo\u017e\u0148uje prov\u00e1d\u011bt experimenty ve sc\u00e9n\u00e1\u0159\u00edch bl\u00edzk\u00fdch skute\u010dn\u00fdm podm\u00ednk\u00e1m. N\u00e1stroje a metodologie modelov\u00e1n\u00ed s\u00edt\u011b vyvinut\u00e9 b\u011bhem experimentu umo\u017enily na po\u010d\u00edta\u010di s 4 TB RAM simulovat provoz s\u00edt\u011b o 6489 uzlech Tor, k n\u00ed\u017e je sou\u010dasn\u011b p\u0159ipojeno 792 tis\u00edc virtu\u00e1ln\u00edch u\u017eivatel\u016f. <\/p>\n

Je uvedeno, \u017ee se jedn\u00e1 o prvn\u00ed plnohodnotnou simulaci s\u00edt\u011b Tor, jej\u00ed\u017e po\u010det uzl\u016f odpov\u00edd\u00e1 re\u00e1ln\u00e9 s\u00edti (aktu\u00e1ln\u00ed s\u00ed\u0165 Tor m\u00e1 p\u0159ibli\u017en\u011b 6 tis\u00edc uzl\u016f a 2 miliony p\u0159ipojen\u00fdch u\u017eivatel\u016f). Plnohodnotn\u00e1 simulace s\u00edt\u011b Tor p\u0159edstavuje zaj\u00edmavost z hlediska odhalov\u00e1n\u00ed \u00fazk\u00fdch m\u00edst, modelov\u00e1n\u00ed chov\u00e1n\u00ed b\u011bhem \u00fatok\u016f, testov\u00e1n\u00ed nov\u00fdch optimaliza\u010dn\u00edch metod v re\u00e1ln\u00fdch podm\u00ednk\u00e1ch a ov\u011b\u0159ov\u00e1n\u00ed koncept\u016f souvisej\u00edc\u00edch s bezpe\u010dnost\u00ed. <\/p>\n

S plnohodnotn\u00fdm simul\u00e1torem budou v\u00fdvoj\u00e1\u0159i Tor moci opustit praxi prov\u00e1d\u011bn\u00ed experiment\u016f v z\u00e1kladn\u00ed s\u00edti nebo na jednotliv\u00fdch pracovn\u00edch uzlech, kter\u00e9 p\u0159edstavuj\u00ed dodate\u010dn\u00e9 riziko naru\u0161en\u00ed soukrom\u00ed u\u017eivatel\u016f a nevyhnou se vzniku poruch. Nap\u0159\u00edklad v n\u00e1sleduj\u00edc\u00edch m\u011bs\u00edc\u00edch se o\u010dek\u00e1v\u00e1 zaveden\u00ed nov\u00e9 protokolu pro \u0159\u00edzen\u00ed p\u0159et\u00ed\u017een\u00ed v Tor a simulace umo\u017en\u00ed d\u016fkladn\u011b prozkoumat jeho fungov\u00e1n\u00ed p\u0159ed nasazen\u00edm v re\u00e1ln\u00e9 s\u00edti. <\/p>\n

Krom\u011b vylou\u010den\u00ed vlivu experiment\u016f na soukrom\u00ed a spolehlivost provozu z\u00e1kladn\u00ed s\u00edt\u011b Tor nab\u00eddne existence samostatn\u00fdch testovac\u00edch s\u00edt\u00ed mo\u017enost rychle testovat a ladit nov\u00fd k\u00f3d b\u011bhem v\u00fdvoje, okam\u017eit\u011b zav\u00e1d\u011bt zm\u011bny pro v\u0161echny uzly a u\u017eivatele bez nutnosti \u010dek\u00e1n\u00ed na dokon\u010den\u00ed dlouh\u00fdch mezif\u00e1z\u00ed nasazen\u00ed, a rychleji vytv\u00e1\u0159et a testovat prototypy s implementac\u00ed nov\u00fdch n\u00e1pad\u016f. <\/p>\n

Prob\u00edh\u00e1 pr\u00e1ce na vylep\u0161en\u00ed n\u00e1stroj\u016f, kter\u00e1, jak uvedli v\u00fdvoj\u00e1\u0159i, sn\u00ed\u017e\u00ed spot\u0159ebu zdroj\u016f desetkr\u00e1t a umo\u017en\u00ed na stejn\u00e9m vybaven\u00ed simulovat pr\u00e1ci s\u00edt\u00ed, kter\u00e9 p\u0159ekon\u00e1vaj\u00ed skute\u010dnou s\u00ed\u0165, co\u017e m\u016f\u017ee b\u00fdt pot\u0159ebn\u00e9 pro odhalen\u00ed mo\u017en\u00fdch probl\u00e9m\u016f se \u0161k\u00e1lov\u00e1n\u00edm Tor. B\u011bhem pr\u00e1ce byly tak\u00e9 vytvo\u0159eny nov\u00e9 metody modelov\u00e1n\u00ed s\u00edt\u011b, kter\u00e9 umo\u017e\u0148uj\u00ed p\u0159edpov\u00eddat zm\u011bny stavu s\u00edt\u011b v \u010dase a pou\u017e\u00edvat pozad\u00ed gener\u00e1tory provozu k simulaci aktivity u\u017eivatel\u016f. <\/p>\n

V\u00fdzkumn\u00edci tak\u00e9 zkoumali souvislost mezi velikost\u00ed simulovan\u00e9 s\u00edt\u011b a p\u0159esnost\u00ed projektov\u00e1n\u00ed v\u00fdsledk\u016f experiment\u016f na skute\u010dnou s\u00ed\u0165. B\u011bhem v\u00fdvoje Tor se p\u0159edb\u011b\u017en\u00e1 kontrola proveden\u00fdch zm\u011bn a optimalizac\u00ed prov\u00e1d\u00ed v mal\u00fdch testovac\u00edch s\u00edt\u00edch, kter\u00e9 obsahuj\u00ed v\u00fdrazn\u011b m\u00e9n\u011b uzl\u016f a u\u017eivatel\u016f ne\u017e skute\u010dn\u00e1 s\u00ed\u0165. Bylo zji\u0161t\u011bno, \u017ee statistick\u00e9 chyby p\u0159edpov\u011bd\u00ed z\u00edskan\u00fdch p\u0159i prov\u00e1d\u011bn\u00ed mal\u00fdch simulac\u00ed lze kompenzovat opakovan\u00fdm prov\u00e1d\u011bn\u00edm nez\u00e1visl\u00fdch experiment\u016f s r\u016fzn\u00fdmi sadami vstupn\u00edch dat, p\u0159i\u010dem\u017e \u010d\u00edm v\u011bt\u0161\u00ed je simulovan\u00e1 s\u00ed\u0165, t\u00edm m\u00e9n\u011b opakov\u00e1n\u00ed je pot\u0159eba k z\u00edsk\u00e1n\u00ed statisticky v\u00fdznamn\u00fdch z\u00e1v\u011br\u016f. <\/p>\n

Pro modelov\u00e1n\u00ed a simulaci s\u00edt\u011b Tor v\u00fdzkumn\u00edci rozv\u00edjej\u00ed n\u011bkolik otev\u0159en\u00fdch projekt\u016f distribuovan\u00fdch pod licenc\u00ed BSD: <\/p>\n