{"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\/es\/blog\/news\/proekt-tfc-razvivaet-paranoidalno-zashhishhyonnuyu-sistemu-obmena-soobshheniyami","title":{"rendered":"El proyecto TFC desarrolla un sistema de mensajer\u00eda paranoicamente protegido.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>En el marco del proyecto <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\">TFC<\/a><\/noindex> (Tinfoil Chat) se ha intentado crear un prototipo de un sistema de mensajer\u00eda paranoicamente protegido que mantenga la privacidad de la correspondencia incluso ante la compromiso de los dispositivos finales. Para facilitar la auditor\u00eda, el c\u00f3digo del proyecto est\u00e1 escrito en Python y <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\">est\u00e1 disponible<\/a><\/noindex> bajo la licencia GPLv3.<\/p>\n<p>Los sistemas de mensajer\u00eda actuales que utilizan cifrado de extremo a extremo protegen la correspondencia de la interceptaci\u00f3n en los servidores intermedios y del an\u00e1lisis del tr\u00e1fico en tr\u00e1nsito, pero no protegen contra problemas en el dispositivo del cliente. Para comprometer sistemas basados en cifrado de extremo a extremo, es suficiente comprometer el sistema operativo, el firmware o la aplicaci\u00f3n de mensajer\u00eda en el dispositivo final, por ejemplo, a trav\u00e9s de la explotaci\u00f3n de vulnerabilidades previamente desconocidas, mediante la inserci\u00f3n inicial de malware en el dispositivo o mediante la entrega de actualizaciones falsas con puertas traseras (por ejemplo, bajo presi\u00f3n de agencias de seguridad o grupos criminales). Incluso si las claves para el cifrado est\u00e1n en un token separado, siempre existe la posibilidad de rastrear procesos, interceptar datos desde el teclado y monitorear la salida en pantalla con el control del sistema del usuario.<\/p>\n<p>TFC ofrece un complejo software-hardware que requiere el uso de tres computadoras separadas por parte del cliente y un divisor de hardware especial. Todo el tr\u00e1fico durante la interacci\u00f3n de los participantes de la mensajer\u00eda se transmite a trav\u00e9s de la red an\u00f3nima Tor, y los programas de mensajer\u00eda se implementan en forma de servicios ocultos de Tor (los usuarios se identifican al enviar mensajes mediante direcciones de servicios ocultos y claves). <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/fc12f37e9af2ef375c0c55ddf739e8900de383e2\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f726561646d652f6f766572766965772e706e67\"><img decoding=\"async\" alt=\"El proyecto TFC desarrolla un sistema de mensajer\u00eda paranoicamente protegido.\" src=\"\/wp-content\/uploads\/2020\/02\/32f184a1c4d73f8f0182ad738985e8ec.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>La primera computadora act\u00faa como puerta de enlace para conectarse a la red y activar el servicio oculto de Tor. La puerta de enlace solo manipula datos ya cifrados, mientras que los dos restantes se utilizan para cifrar y descifrar. La segunda computadora se puede utilizar solo para descifrar y mostrar los mensajes recibidos, y la tercera solo para cifrar y enviar nuevos mensajes. En consecuencia, la segunda computadora tiene solo las claves para descifrar, y la tercera solo las claves para cifrar. <\/p>\n<p>Los segundo y tercer ordenadores no tienen conexi\u00f3n directa a la red y est\u00e1n separados del ordenador de puerta de enlace por un divisor USB especial que utiliza el principio \u00ab<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Unidirectional_network\">diodo de datos<\/a><\/noindex>\u00bb y permite el paso de datos f\u00edsicamente solo en una direcci\u00f3n. El divisor permite \u00fanicamente el env\u00edo de datos hacia el segundo ordenador y solo la recepci\u00f3n de datos del tercer ordenador. La direcci\u00f3n de los datos en el divisor se restringe mediante <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9E%D0%BF%D1%82%D1%80%D0%BE%D0%BD\">optrones<\/a><\/noindex> (una simple interrupci\u00f3n de las l\u00edneas Tx y Rx en el cable no es suficiente, ya que la interrupci\u00f3n no excluye la transmisi\u00f3n de datos en direcci\u00f3n inversa y no garantiza que la l\u00ednea Tx no se utilizar\u00e1 para leer, y Rx para transmitir). El divisor puede ser construido con materiales accesibles, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/TTL-Data-Diode-(breadboard)\">los esquemas se adjuntan<\/a><\/noindex> (<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/TTL-Data-Diode-(PCB)\">PCB<\/a><\/noindex>) y est\u00e1n disponibles bajo la licencia GNU FDL 1.3. <\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/be91382229596f4ae22250ed86091265e80ff6d7\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f726561646d652f646174615f64696f64652e6a7067\"><img decoding=\"async\" alt=\"El proyecto TFC desarrolla un sistema de mensajer\u00eda paranoicamente protegido.\" src=\"\/wp-content\/uploads\/2020\/02\/d643e70b41d8183d43a6af8f69815d83.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Con este esquema, la compromisi\u00f3n del puente <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/Security-design\">no permitir\u00e1<\/a><\/noindex> acceder a las claves de cifrado y no permitir\u00e1 continuar el ataque contra los dispositivos restantes. En caso de comprometer el ordenador donde est\u00e1n almacenadas las claves para la descifrado, no ser\u00e1 posible transmitir informaci\u00f3n al mundo exterior, ya que el flujo de datos est\u00e1 limitado solo a la recepci\u00f3n de informaci\u00f3n, y la transmisi\u00f3n inversa est\u00e1 bloqueada por el diodo de datos.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/6f05945bc2ef889b1ba74d0e5dc282a00a14aa49\/68747470733a2f2f7777772e63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f73656375726974795f64657369676e2f385f73706c69745f746362322e706e67\"><img decoding=\"async\" alt=\"El proyecto TFC desarrolla un sistema de mensajer\u00eda paranoicamente protegido.\" src=\"\/wp-content\/uploads\/2020\/02\/e376273bc8d4d9d7956eb7c801526f61.png\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>El cifrado se ha realizado con claves de 256 bits utilizando XChaCha20-Poly1305, y para proteger las claves se aplica una funci\u00f3n hash lenta <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/P-H-C\/phc-winner-argon2\/blob\/master\/argon2-specs.pdf\">Argon2id<\/a><\/noindex>. Para el intercambio de claves se utiliza <noindex><a rel=\"nofollow\" href=\"https:\/\/eprint.iacr.org\/2015\/625.pdf\">X448<\/a><\/noindex> (el protocolo Diffie-Hellman basado en Curve448) o claves PSK (<noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Pre-shared_key\">precompartidas<\/a><\/noindex>). Cada mensaje se transmite en modo de perfecta confidencialidad directa (PFS, <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Perfect_forward_secrecy\">Perfect Forward Secrecy<\/a><\/noindex>) basadas en hashes Blake2b, en el que la compromisi\u00f3n de una de las claves a largo plazo no permite descifrar una sesi\u00f3n interceptada anteriormente. La interfaz de la aplicaci\u00f3n es extremadamente simple e incluye una ventana dividida en tres \u00e1reas: env\u00edo, recepci\u00f3n y una l\u00ednea de comandos con un registro de interacci\u00f3n con la puerta de enlace. El control se realiza a trav\u00e9s de un <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/maqp\/tfc\/wiki\/Commands\">conjunto de comandos<\/a><\/noindex>.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"https:\/\/camo.githubusercontent.com\/0d07bc06ac5321d1f0aec9b3cf147fde8faf9810\/68747470733a2f2f63732e68656c73696e6b692e66692f752f6f6f7474656c612f77696b692f686f775f746f5f7573652f6c61756e63682f335f312e706e67\"><img decoding=\"async\" alt=\"El proyecto TFC desarrolla un sistema de mensajer\u00eda paranoicamente protegido.\" 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>Fuente: <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 5.0.2 - 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