{"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\/pt\/blog\/news\/proekt-tfc-razvivaet-paranoidalno-zashhishhyonnuyu-sistemu-obmena-soobshheniyami","title":{"rendered":"O projeto TFC desenvolve um sistema de troca de mensagens paranoicamente seguro","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>No \u00e2mbito do projeto <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\">TFC<\/a><\/noindex> (Tinfoil Chat) foi realizada uma tentativa de criar um prot\u00f3tipo de um sistema de troca de mensagens paranoide e protegido, que manteria o segredo das conversas mesmo em caso de comprometimento dos dispositivos finais. Para facilitar a auditoria, o c\u00f3digo do projeto foi escrito em Python e <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\">dispon\u00edvel<\/a><\/noindex> sob a licen\u00e7a GPLv3.<\/p>\n<p>Os sistemas de troca de mensagens, hoje em dia, que utilizam criptografia de ponta a ponta, permitem proteger as conversas de intercepta\u00e7\u00f5es em servidores intermedi\u00e1rios e de an\u00e1lises de tr\u00e1fego em tr\u00e2nsito, mas n\u00e3o protegem contra problemas nos dispositivos do cliente. Para comprometer sistemas baseados em criptografia de ponta a ponta, \u00e9 suficiente comprometer o sistema operacional, o firmware ou o aplicativo de mensagens no dispositivo final, por exemplo, explorando vulnerabilidades previamente desconhecidas, atrav\u00e9s da introdu\u00e7\u00e3o inicial de backdoors de software ou hardware no dispositivo ou pela entrega de uma atualiza\u00e7\u00e3o falsa com um backdoor (por exemplo, sob press\u00e3o de ag\u00eancias de seguran\u00e7a ou grupos criminosos). Mesmo que as chaves para a criptografia estejam em um token separado, com controle sobre o sistema do usu\u00e1rio sempre h\u00e1 a possibilidade de rastreamento de processos, intercepta\u00e7\u00e3o de dados do teclado e monitoramento da sa\u00edda na tela.<\/p>\n<p>O TFC oferece um complexo de hardware e software que requer o uso de tr\u00eas computadores separados no lado do cliente e um splitter de hardware especial. Todo o tr\u00e1fego durante a intera\u00e7\u00e3o entre os participantes da troca de mensagens \u00e9 transmitido atrav\u00e9s da rede an\u00f4nima Tor, e os programas de troca de mensagens s\u00e3o realizados na forma de servi\u00e7os ocultos do Tor (os usu\u00e1rios na troca de mensagens s\u00e3o identificados pelos endere\u00e7os dos servi\u00e7os ocultos e chaves). <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/fc12f37e9af2ef375c0c55ddf739e8900de383e2\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f726561646d652f6f766572766965772e706e67\"><img decoding=\"async\" alt=\"O projeto TFC desenvolve um sistema de troca de mensagens paranoicamente seguro\" src=\"\/wp-content\/uploads\/2020\/02\/32f184a1c4d73f8f0182ad738985e8ec.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>O primeiro computador atua como um gateway para se conectar \u00e0 rede e iniciar o servi\u00e7o oculto do Tor. O gateway manipula apenas os dados j\u00e1 criptografados, e para a criptografia e descriptografia, s\u00e3o utilizados os outros dois computadores. O segundo computador pode ser usado apenas para descriptografar e exibir as mensagens recebidas, enquanto o terceiro \u00e9 usado apenas para criptografar e enviar novas mensagens. Assim, o segundo computador possui apenas as chaves para descriptografia e o terceiro possui apenas as chaves para criptografia. <\/p>\n<p>O segundo e o terceiro computadores n\u00e3o possuem conex\u00e3o direta \u00e0 rede e est\u00e3o separados do computador-gateway por um divisor USB especial, que utiliza o princ\u00edpio \u00ab<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Unidirectional_network\">diodo de dados<\/a><\/noindex>\u00bb e s\u00f3 permite a passagem de dados fisicamente em uma \u00fanica dire\u00e7\u00e3o. O divisor admite apenas o envio de dados em dire\u00e7\u00e3o ao segundo computador e apenas a recep\u00e7\u00e3o de dados do terceiro computador. A dire\u00e7\u00e3o dos dados no divisor \u00e9 limitada por meio de <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9E%D0%BF%D1%82%D1%80%D0%BE%D0%BD\">optoacopladores<\/a><\/noindex> (uma simples interrup\u00e7\u00e3o das linhas Tx e Rx no cabo n\u00e3o \u00e9 suficiente, pois a ruptura n\u00e3o exclui a transmiss\u00e3o de dados na dire\u00e7\u00e3o oposta e n\u00e3o garante que a linha Tx n\u00e3o ser\u00e1 usada para leitura e a Rx para transmiss\u00e3o). O divisor pode ser montado a partir de componentes dispon\u00edveis, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/TTL-Data-Diode-(breadboard)\">os esquemas est\u00e3o anexados<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/TTL-Data-Diode-(PCB)\">PCB<\/a><\/noindex>) e est\u00e3o dispon\u00edveis sob a licen\u00e7a GNU FDL 1.3. <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/be91382229596f4ae22250ed86091265e80ff6d7\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f726561646d652f646174615f64696f64652e6a7067\"><img decoding=\"async\" alt=\"O projeto TFC desenvolve um sistema de troca de mensagens paranoicamente seguro\" src=\"\/wp-content\/uploads\/2020\/02\/d643e70b41d8183d43a6af8f69815d83.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Com esse esquema, a comprometimento do gateway <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/Security-design\">n\u00e3o permitir\u00e1<\/a><\/noindex> obter acesso \u00e0s chaves de criptografia e n\u00e3o permitir\u00e1 continuar o ataque aos dispositivos restantes. Em caso de comprometimento do computador que armazena as chaves para descriptografia, as informa\u00e7\u00f5es dele n\u00e3o poder\u00e3o ser transmitidas para o mundo exterior, pois o fluxo de dados \u00e9 limitado apenas \u00e0 recep\u00e7\u00e3o de informa\u00e7\u00f5es, e a transmiss\u00e3o reversa \u00e9 bloqueada pelo diodo de dados.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/6f05945bc2ef889b1ba74d0e5dc282a00a14aa49\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f73656375726974795f64657369676e2f385f73706c69745f746362322e706e67\"><img decoding=\"async\" alt=\"O projeto TFC desenvolve um sistema de troca de mensagens paranoicamente seguro\" src=\"\/wp-content\/uploads\/2020\/02\/e376273bc8d4d9d7956eb7c801526f61.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>A criptografia \u00e9 realizada com base em chaves de 256 bits usando XChaCha20-Poly1305, e uma fun\u00e7\u00e3o hash lenta \u00e9 aplicada para proteger as chaves <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/P-H-C\/phc-winner-argon2\/blob\/master\/argon2-specs.pdf\">Argon2id<\/a><\/noindex>. Para a troca de chaves, \u00e9 utilizado <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2015\/625.pdf\">X448<\/a><\/noindex> (o protocolo Diffie-Hellman baseado em Curve448) ou chaves PSK (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Pre-shared_key\">pr\u00e9-compartilhadas<\/a><\/noindex>). Cada mensagem \u00e9 transmitida no modo de perfeita secreta direta (PFS, <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Perfect_forward_secrecy\">Perfeita Secreta para o Futuro<\/a><\/noindex>) baseadas em hashes Blake2b, onde a comprova\u00e7\u00e3o de uma das chaves de longo prazo n\u00e3o permite decifrar uma sess\u00e3o interceptada anteriormente. A interface do aplicativo \u00e9 extremamente simples e inclui uma janela dividida em tr\u00eas \u00e1reas - envio, recebimento e uma linha de comando com o log de intera\u00e7\u00e3o com o gateway. O controle \u00e9 realizado atrav\u00e9s de um <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/Commands\">conjunto de comandos especial<\/a><\/noindex>.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/0d07bc06ac5321d1f0aec9b3cf147fde8faf9810\/68747470733a2f2f63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f686f775f746f5f7573652f6c61756e63682f335f312e706e67\"><img decoding=\"async\" alt=\"O projeto TFC desenvolve um sistema de troca de mensagens paranoicamente seguro\" 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>Fonte: <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 5.0.3 - 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