{"id":56034,"date":"2020-02-03T00:00:00","date_gmt":"2020-02-02T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/proekt-tfc-razvivaet-paranoidalno-zashhishhyonnuyu-sistemu-obmena-soobshheniyami"},"modified":"2020-02-18T14:04:12","modified_gmt":"2020-02-18T11:04:12","slug":"proekt-tfc-razvivaet-paranoidalno-zashhishhyonnuyu-sistemu-obmena-soobshheniyami","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/proekt-tfc-razvivaet-paranoidalno-zashhishhyonnuyu-sistemu-obmena-soobshheniyami","title":{"rendered":"Projekt TFC rozv\u00edj\u00ed paranoidn\u011b chr\u00e1n\u011bn\u00fd syst\u00e9m v\u00fdm\u011bny zpr\u00e1v","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V r\u00e1mci projektu TFC<\/a><\/noindex> (Tinfoil Chat) byla podniknuta pokus o vytvo\u0159en\u00ed prototypu paranoidn\u011b zabezpe\u010den\u00e9ho syst\u00e9mu pro sm\u011bnu zpr\u00e1v, kter\u00fd by uchov\u00e1val tajemstv\u00ed konverzac\u00ed i p\u0159i kompromitaci koncov\u00fdch za\u0159\u00edzen\u00ed. Pro usnadn\u011bn\u00ed prov\u00e1d\u011bn\u00ed auditu je k\u00f3d projektu naps\u00e1n v jazyce Python a je dostupn\u00e1<\/a><\/noindex> distribuov\u00e1n pod licenc\u00ed GPLv3.<\/p>\n

Dne\u0161n\u00ed b\u011b\u017en\u011b pou\u017e\u00edvan\u00e9 syst\u00e9my pro sm\u011bnu zpr\u00e1v, kter\u00e9 vyu\u017e\u00edvaj\u00ed \u0161ifrov\u00e1n\u00ed end-to-end, chr\u00e1n\u00ed konverzace p\u0159ed odposlechem na prost\u0159edn\u00edch serverech a p\u0159ed anal\u00fdzou transitn\u00edho provozu, ale nechr\u00e1n\u00ed p\u0159ed probl\u00e9my na stran\u011b klientsk\u00e9ho za\u0159\u00edzen\u00ed. Pro kompromitaci syst\u00e9m\u016f zalo\u017een\u00fdch na end-to-end \u0161ifrov\u00e1n\u00ed sta\u010d\u00ed kompromitovat opera\u010dn\u00ed syst\u00e9m, firmware nebo aplikaci-messenger na koncov\u00e9m za\u0159\u00edzen\u00ed, nap\u0159\u00edklad prost\u0159ednictv\u00edm exploitace dosud nezn\u00e1m\u00fdch zranitelnost\u00ed, po\u010d\u00e1te\u010dn\u00edm zaveden\u00edm softwarov\u00fdch nebo hardwarov\u00fdch zadn\u00edch vr\u00e1tek do za\u0159\u00edzen\u00ed, nebo dod\u00e1n\u00edm fale\u0161n\u00e9 aktualizace s backdoorem (nap\u0159\u00edklad p\u0159i tlaku na v\u00fdvoj\u00e1\u0159e ze strany tajn\u00fdch slu\u017eeb nebo krimin\u00e1ln\u00edch skupin). I kdy\u017e jsou \u0161ifrovac\u00ed kl\u00ed\u010de uchov\u00e1v\u00e1ny na samostatn\u00e9m tokenu, p\u0159i existenci kontroly nad syst\u00e9mem u\u017eivatele v\u017edy z\u016fst\u00e1v\u00e1 mo\u017enost trasov\u00e1n\u00ed proces\u016f, odposlechu dat z kl\u00e1vesnice a sledov\u00e1n\u00ed v\u00fdstupu na obrazovku.<\/p>\n

TFC nab\u00edz\u00ed programov\u011b-hardwarov\u00fd komplex, kter\u00fd vy\u017eaduje pou\u017eit\u00ed na stran\u011b klienta t\u0159\u00ed samostatn\u00fdch po\u010d\u00edta\u010d\u016f a speci\u00e1ln\u00edho hardwarov\u00e9ho splitteru. Ve\u0161ker\u00fd provoz b\u011bhem interakce \u00fa\u010dastn\u00edk\u016f sm\u011bny zpr\u00e1v je p\u0159en\u00e1\u0161en prost\u0159ednictv\u00edm anonymn\u00ed s\u00edt\u011b Tor, a programy pro sm\u011bnu zpr\u00e1v jsou provedeny ve form\u011b skryt\u00fdch slu\u017eeb Tor (u\u017eivatel\u00e9 p\u0159i sm\u011bn\u011b zpr\u00e1v se identifikuj\u00ed podle adres skryt\u00fdch slu\u017eeb a kl\u00ed\u010d\u016f). <\/p>\n

\"Projekt<\/a><\/noindex><\/center><\/p>\n

Prvn\u00ed po\u010d\u00edta\u010d funguje jako br\u00e1na pro p\u0159ipojen\u00ed k s\u00edti a spu\u0161t\u011bn\u00ed skryt\u00e9 slu\u017eby Tor. Br\u00e1na manipuluje pouze s ji\u017e za\u0161ifrovan\u00fdmi daty, zat\u00edmco pro \u0161ifrov\u00e1n\u00ed a de\u0161ifrov\u00e1n\u00ed jsou pou\u017eity dva zb\u00fdvaj\u00edc\u00ed po\u010d\u00edta\u010de. Druh\u00fd po\u010d\u00edta\u010d m\u016f\u017ee b\u00fdt pou\u017eit pouze pro de\u0161ifrov\u00e1n\u00ed a zobrazov\u00e1n\u00ed p\u0159ijat\u00fdch zpr\u00e1v, t\u0159et\u00ed pouze pro \u0161ifrov\u00e1n\u00ed a odes\u00edl\u00e1n\u00ed nov\u00fdch zpr\u00e1v. P\u0159\u00edslu\u0161n\u011b m\u00e1 druh\u00fd po\u010d\u00edta\u010d pouze kl\u00ed\u010de pro de\u0161ifrov\u00e1n\u00ed, zat\u00edmco t\u0159et\u00ed m\u00e1 pouze kl\u00ed\u010de pro \u0161ifrov\u00e1n\u00ed. <\/p>\n

Druh\u00fd a t\u0159et\u00ed po\u010d\u00edta\u010d nejsou p\u0159\u00edmo p\u0159ipojeny k s\u00edti a jsou od po\u010d\u00edta\u010de-gateway odd\u011bleny speci\u00e1ln\u00edm USB rozbo\u010dova\u010dem, kter\u00fd vyu\u017e\u00edv\u00e1 princip «datov\u00e1 dioda<\/a><\/noindex>» a umo\u017e\u0148uje p\u0159enos dat fyzicky pouze v jednom sm\u011bru. Rozbo\u010dova\u010d umo\u017e\u0148uje pouze odes\u00edl\u00e1n\u00ed dat sm\u011brem k druh\u00e9mu po\u010d\u00edta\u010di a pouze p\u0159\u00edjem dat od t\u0159et\u00edho po\u010d\u00edta\u010de. Sm\u011br dat v rozbo\u010dova\u010di je omezen pomoc\u00ed optron\u016f<\/a><\/noindex> (oby\u010dejn\u00e9 p\u0159eru\u0161en\u00ed Tx a Rx linek v kabelu nesta\u010d\u00ed, proto\u017ee p\u0159eru\u0161en\u00ed nevylu\u010duje p\u0159enos dat v opa\u010dn\u00e9m sm\u011bru a nezaru\u010duje, \u017ee linka Tx nebude pou\u017eita pro \u010dten\u00ed, zat\u00edmco Rx pro p\u0159enos). Rozbo\u010dova\u010d lze sestavit z dostupn\u00fdch komponent\u016f, sch\u00e9mata jsou p\u0159ilo\u017eena<\/a><\/noindex> (PCB<\/a><\/noindex>) a jsou k dispozici pod licenc\u00ed GNU FDL 1.3. <\/p>\n

\"Projekt<\/a><\/noindex><\/center><\/p>\n

P\u0159i podobn\u00e9m sch\u00e9matu kompromitace gateway neumo\u017en\u00ed<\/a><\/noindex> z\u00edskat p\u0159\u00edstup k \u0161ifrovac\u00edm kl\u00ed\u010d\u016fm a neumo\u017en\u00ed pokra\u010dovat v \u00fatoku na zb\u00fdvaj\u00edc\u00ed za\u0159\u00edzen\u00ed. V p\u0159\u00edpad\u011b kompromitace po\u010d\u00edta\u010de, na kter\u00e9m jsou um\u00edst\u011bny kl\u00ed\u010de pro de\u0161ifrov\u00e1n\u00ed, nebude mo\u017en\u00e9 informace z n\u011bj p\u0159en\u00e9st do vn\u011bj\u0161\u00edho sv\u011bta, proto\u017ee tok dat je omezen pouze na p\u0159ij\u00edm\u00e1n\u00ed informac\u00ed a zp\u011btn\u00fd p\u0159enos blokuje datov\u00e1 dioda.<\/p>\n

\"Projekt<\/a><\/noindex><\/center><\/p>\n

\u0160ifrov\u00e1n\u00ed je realizov\u00e1no na z\u00e1klad\u011b 256bitov\u00fdch kl\u00ed\u010d\u016f na XChaCha20-Poly1305, pro ochranu kl\u00ed\u010d\u016f heslem se pou\u017e\u00edv\u00e1 pomal\u00e1 hashovac\u00ed funkce Argon2id<\/a><\/noindex>. Pro v\u00fdm\u011bnu kl\u00ed\u010d\u016f se pou\u017e\u00edv\u00e1 X448<\/a><\/noindex> (protokol Diffie - Hellman na z\u00e1klad\u011b Curve448) nebo PSK kl\u00ed\u010d\u016f (pre-shared<\/a><\/noindex>). Ka\u017ed\u00e1 zpr\u00e1va je p\u0159en\u00e1\u0161ena v re\u017eimu dokonal\u00e9 p\u0159\u00edm\u00e9 tajnosti (PFS, Perfect Forward Secrecy<\/a><\/noindex>) na z\u00e1klad\u011b hash\u016f Blake2b, p\u0159i kter\u00e9m kompromitace jednoho z dlouhodob\u00fdch kl\u00ed\u010d\u016f neumo\u017e\u0148uje de\u0161ifrovat d\u0159\u00edve zachycenou relaci. U\u017eivatelsk\u00e9 rozhran\u00ed aplikace je maxim\u00e1ln\u011b jednoduch\u00e9 a zahrnuje okno rozd\u011blen\u00e9 na t\u0159i oblasti - odes\u00edl\u00e1n\u00ed, p\u0159\u00edjem a p\u0159\u00edkazov\u00fd \u0159\u00e1dek s logem interakce se gateway. Ovl\u00e1d\u00e1n\u00ed se prov\u00e1d\u00ed p\u0159es speci\u00e1ln\u00ed souboru p\u0159\u00edkaz\u016f<\/a><\/noindex>.<\/p>\n

\"Projekt<\/a><\/noindex><\/center><\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0440\u0430\u043c\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 TFC (Tinfoil Chat) \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u043d\u044f\u0442\u0430 \u043f\u043e\u043f\u044b\u0442\u043a\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f\u0430 \u043f\u0430\u0440\u0430\u043d\u043e\u0438\u0434\u0430\u043b\u044c\u043d\u043e-\u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043e\u0431\u043c\u0435\u043d\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\u043c\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u043b\u0430 \u0431\u044b \u0442\u0430\u0439\u043d\u0443 \u043f\u0435\u0440\u0435\u043f\u0438\u0441\u043a\u0438 \u0434\u0430\u0436\u0435 \u043f\u0440\u0438 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0435\u0442\u0430\u0446\u0438\u0438 \u043a\u043e\u043d\u0435\u0447\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432. \u0414\u043b\u044f \u0443\u043f\u0440\u043e\u0449\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0434\u0438\u0442\u0430 \u043a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python \u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv3. \u0420\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0451\u043d\u043d\u044b\u0435 \u043d\u044b\u043d\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043e\u0431\u043c\u0435\u043d\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\u043c\u0438, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0438\u0435 \u0441\u043a\u0432\u043e\u0437\u043d\u043e\u0435 \u0448\u0438\u0444\u0440\u043e\u0432\u0430\u043d\u0438\u0435, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0437\u0430\u0449\u0438\u0442\u0438\u0442\u044c \u043f\u0435\u0440\u0435\u043f\u0438\u0441\u043a\u0443 \u043e\u0442 \u043f\u0435\u0440\u0435\u0445\u0432\u0430\u0442\u0430 \u043d\u0430 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u044b\u0445 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445 […]<\/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-56034","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Projekt TFC rozv\u00edj\u00ed paranoidn\u011b chr\u00e1n\u011bn\u00fd syst\u00e9m pro v\u00fdm\u011bnu zpr\u00e1v | ProHoster","description":"V r\u00e1mci projektu TFC (Tinfoil Chat) byla podniknuta snaha o vytvo\u0159en\u00ed prototypu paranoidn\u011b chr\u00e1n\u011bn\u00e9ho syst\u00e9mu pro v\u00fdm\u011bnu zpr\u00e1v, kter\u00fd.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/proekt-tfc-razvivaet-paranoidalno-zashhishhyonnuyu-sistemu-obmena-soobshheniyami","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041f\u0440\u043e\u0435\u043a\u0442 TFC \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442 \u043f\u0430\u0440\u0430\u043d\u043e\u0438\u0434\u0430\u043b\u044c\u043d\u043e \u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u0443\u044e \u0441\u0438\u0441\u0442\u0435\u043c\u0443 \u043e\u0431\u043c\u0435\u043d\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\u043c\u0438 | ProHoster","og:description":"\u0412 \u0440\u0430\u043c\u043a\u0430\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 TFC (Tinfoil Chat) \u043f\u0440\u0435\u0434\u043f\u0440\u0438\u043d\u044f\u0442\u0430 \u043f\u043e\u043f\u044b\u0442\u043a\u0430 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f\u0430 \u043f\u0430\u0440\u0430\u043d\u043e\u0438\u0434\u0430\u043b\u044c\u043d\u043e-\u0437\u0430\u0449\u0438\u0449\u0451\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043e\u0431\u043c\u0435\u043d\u0430 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\u043c\u0438, 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