{"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\/et\/blog\/news\/proekt-tfc-razvivaet-paranoidalno-zashhishhyonnuyu-sistemu-obmena-soobshheniyami","title":{"rendered":"Projekt TFC arendab erakordselt kaitstud s\u00f5numivahetuss\u00fcsteemi.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Projektis <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\">TFC<\/a><\/noindex> (Tinfoil Chat) on tehtud katse luua protot\u00fc\u00fcp paranoodiliselt kaitstud s\u00f5numite vahetuss\u00fcsteemist, mis s\u00e4ilitaks kirjavahetuse saladuse isegi l\u00f5ppseadmete kompromiteerimise korral. Auditite lihtsustamiseks on projekti kood kirjutatud Pythonis ja <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\">saadaval<\/a><\/noindex> ja GPLv3 litsentsi alusel.<\/p>\n<p>T\u00e4nap\u00e4eval levinud s\u00f5numite vahetuss\u00fcsteemid, mis kasutavad l\u00f5pp-punktide kr\u00fcpteerimist, kaitsevad kirjavahetust vaheserverites peetmise ja \u00fclemineku liikluse anal\u00fc\u00fcsi eest, kuid ei kaitse l\u00f5pp-seadme probleemide eest. L\u00f5pp-punktide kr\u00fcpteerimises piisab operatsioonis\u00fcsteemi, p\u00fcsivara v\u00f5i s\u00f5numirakenduse, n\u00e4iteks varjatud haavatavuste kasutamise, seadmesse algselt sisseviidud tark- v\u00f5i riistvaraliste tagasik\u00e4ikude v\u00f5i vale uuenduse, millel on tagauks (n\u00e4iteks surveteenuseid pakkudes), kompromiteerimisest. Isegi kui kr\u00fcpteerimisv\u00f5tmed asuvad eraldiseisval tokenil, on kasutaja s\u00fcsteemi kontrollimise olemasolul alati v\u00f5imalus protsesside j\u00e4lgimiseks igap\u00e4evastes tegevustes, klaviatuuri andmete pealtkuulamiseks ja ekraaniv\u00e4ljundi j\u00e4lgimiseks.<\/p>\n<p>TFC pakub tarkvara-riistvara komplekti, mis n\u00f5uab kliendi poolel kolme eraldi arvutit ja spetsiaalset riistvaralise jagajat. K\u00f5ik liiklus osalejate vahel s\u00f5numite vahetamisel edastatakse anon\u00fc\u00fcmsesse Tor v\u00f5rgustikku, samas kui s\u00f5numivahetuse programmid on \u00fcles ehitatud Tor'i varjatud teenustena (kasutajad tuvastatakse s\u00f5numite vahetamisel varjatud teenuse aadresside ja v\u00f5tmete j\u00e4rgi). <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/fc12f37e9af2ef375c0c55ddf739e8900de383e2\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f726561646d652f6f766572766965772e706e67\"><img decoding=\"async\" alt=\"Projekt TFC arendab erakordselt kaitstud s\u00f5numivahetuss\u00fcsteemi.\" src=\"\/wp-content\/uploads\/2020\/02\/32f184a1c4d73f8f0182ad738985e8ec.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Esimene arvuti toimib v\u00e4ravana v\u00f5rku sisselogimiseks ja Tor'i varjatud teenuse k\u00e4ivitamiseks. V\u00e4rav manipuleerib ainult juba kr\u00fcpteeritud andmetega, samas kui kr\u00fcpteerimiseks ja dekr\u00fcpteerimiseks kasutatakse kahte \u00fclej\u00e4\u00e4nud arvutit. Teist arvutit v\u00f5ib kasutada ainult dekr\u00fcpteerimiseks ja saadud s\u00f5numite kuvamiseks, kolmandat aga ainult kr\u00fcpteerimiseks ja uute s\u00f5numite saatmiseks. Vastavalt on teisel arvutil ainult dekr\u00fcpteerimise v\u00f5tmed, kolmandal aga ainult kr\u00fcpteerimise v\u00f5tmed. <\/p>\n<p>Teisel ja kolmandal arvutil ei ole otsest \u00fchendust v\u00f5rku ja need on eraldatud v\u00e4ravaarvutist spetsiaalse USB-jaoturi kaudu, mis kasutab p\u00f5him\u00f5tet &#171;<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Unidirectional_network\">andme diood<\/a><\/noindex>&#187; ja edastab andmeid f\u00fc\u00fcsiliselt ainult \u00fches suunas. Jaotur lubab ainult andmete saatmist teise arvuti suunas ja ainult kolmandalt arvutilt andmete vastuv\u00f5tmist. Andmete suund jaoturis on piiratud. <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9E%D0%BF%D1%82%D1%80%D0%BE%D0%BD\">optronide<\/a><\/noindex> abil (lihtne Tx ja Rx joonte katkestamine kaablis ei ole piisav, kuna katkestus ei v\u00e4lista andmete edastamist vastupidises suunas ja ei garanteeri, et Tx joon ei oleks kasutatud lugemiseks, samas kui Rx joon oleks edastamiseks). Jaoturi saab kokku panna kodustest osadest, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/TTL-Data-Diode-(breadboard)\">skeemid on lisatud<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/TTL-Data-Diode-(PCB)\">PCB<\/a><\/noindex>) ja on saadaval GNU FDL 1.3 litsentsi all. <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/be91382229596f4ae22250ed86091265e80ff6d7\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f726561646d652f646174615f64696f64652e6a7067\"><img decoding=\"async\" alt=\"Projekt TFC arendab erakordselt kaitstud s\u00f5numivahetuss\u00fcsteemi.\" src=\"\/wp-content\/uploads\/2020\/02\/d643e70b41d8183d43a6af8f69815d83.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Selle skeemi korral tagab p\u00e4\u00e4supunkti kompromiteerimine <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/Security-design\">keeravad<\/a><\/noindex> kasutada kr\u00fcpteerimisv\u00f5tmeid ja ei v\u00f5imalda r\u00fcnnakut j\u00e4tkata \u00fclej\u00e4\u00e4nud seadmetele. Kui arvuti, kus asuvad dekr\u00fcpteerimisv\u00f5tmed, on kompromiteeritud, ei saa teavet v\u00e4lismaailma edastada, kuna andmevoog on piiratud ainult teabe vastuv\u00f5tmisega ja tagasiside edastamine on blokeeritud andme dioodiga.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/6f05945bc2ef889b1ba74d0e5dc282a00a14aa49\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f73656375726974795f64657369676e2f385f73706c69745f746362322e706e67\"><img decoding=\"async\" alt=\"Projekt TFC arendab erakordselt kaitstud s\u00f5numivahetuss\u00fcsteemi.\" src=\"\/wp-content\/uploads\/2020\/02\/e376273bc8d4d9d7956eb7c801526f61.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Kr\u00fcpteerimine on tehtud 256-bitiste v\u00f5tmete alusel XChaCha20-Poly1305, v\u00f5tmete kaitsmiseks parooli abil kasutatakse aeglast r\u00e4sifunktsiooni <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/P-H-C\/phc-winner-argon2\/blob\/master\/argon2-specs.pdf\">Argon2id<\/a><\/noindex>. V\u00f5tmete vahetamiseks kasutatakse <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2015\/625.pdf\">X448<\/a><\/noindex> (Diffie-Hellmani protokoll Curve448 baasil) v\u00f5i PSK-v\u00f5tmed (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Pre-shared_key\">eelnevalt jagatud<\/a><\/noindex>). Iga s\u00f5num edastatakse t\u00e4iusliku ettepoole suunatud salajane (PFS, <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Perfect_forward_secrecy\">T\u00e4iuslik ettepoole suunatud salajane<\/a><\/noindex>) Blake2b hash'ide baasil, kus \u00fche pikaajalise v\u00f5tme kompromiteerimine ei v\u00f5imalda varasemalt salvestatud seanssi dekr\u00fcpteerida. Rakenduse liides on \u00e4\u00e4rmiselt lihtne ja sisaldab akent, mis on jagatud kolme piirkonda - saatmine, vastuv\u00f5tmine ja k\u00e4surea logi v\u00e4ravaga suhtlemiseks. Juhtimine toimub spetsiaalse kaudu. <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/Commands\">k\u00e4skude komplekti<\/a><\/noindex>.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/0d07bc06ac5321d1f0aec9b3cf147fde8faf9810\/68747470733a2f2f63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f686f775f746f5f7573652f6c61756e63682f335f312e706e67\"><img decoding=\"async\" alt=\"Projekt TFC arendab erakordselt kaitstud s\u00f5numivahetuss\u00fcsteemi.\" src=\"\/wp-content\/uploads\/2020\/02\/2d4d16055b5ba573d725d9731bb17861.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52305\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&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-56034","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 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