{"id":103361,"date":"2022-02-16T21:37:38","date_gmt":"2022-02-16T19:37:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predstavlen-unredacter-instrument-dlya-opredeleniya-pikselizirovannogo-teksta"},"modified":"2022-02-16T21:37:38","modified_gmt":"2022-02-16T19:37:39","slug":"predstavlen-unredacter-instrument-dlya-opredeleniya-pikselizirovannogo-teksta","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/predstavlen-unredacter-instrument-dlya-opredeleniya-pikselizirovannogo-teksta","title":{"rendered":"Unredacter est pr\u00e9sent\u00e9, un outil pour d\u00e9terminer le texte pixelis\u00e9","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

L'outil Unredacter est pr\u00e9sent\u00e9, permettant de restaurer le texte original apr\u00e8s qu'il a \u00e9t\u00e9 cach\u00e9 \u00e0 l'aide de filtres bas\u00e9s sur la pixelisation. Par exemple, le programme peut \u00eatre utilis\u00e9 pour identifier des donn\u00e9es sensibles et des mots de passe pixelis\u00e9s sur des captures d'\u00e9cran ou des images de documents. Il est affirm\u00e9 que l'algorithme mis en \u0153uvre dans Unredacter surpasse des utilitaires similaires pr\u00e9c\u00e9demment disponibles, tels que Depix, et a notamment \u00e9t\u00e9 utilis\u00e9 avec succ\u00e8s pour passer le test de d\u00e9termination de texte pixelis\u00e9 propos\u00e9 par le laboratoire Jumpsec. Le code du programme est \u00e9crit en TypeScript et distribu\u00e9 sous la licence GPLv3. <\/p>\n

Pour restaurer le texte dans Unredacter, une m\u00e9thode d'attaque par force brute est appliqu\u00e9e, selon laquelle une comparaison d'une partie de l'image pixelis\u00e9e d'origine est effectu\u00e9e avec une variante synth\u00e9tis\u00e9e par l'it\u00e9ration de paires de symboles, pixelisables avec diff\u00e9rents d\u00e9calages et caract\u00e9ristiques modifi\u00e9es. Au cours de l'it\u00e9ration, la variante la plus proche du fragment d'origine est progressivement s\u00e9lectionn\u00e9e. Pour un fonctionnement r\u00e9ussi, il est n\u00e9cessaire de deviner correctement la taille, le type et les param\u00e8tres de d\u00e9calage de la police, ainsi que de calculer la taille de la cellule dans la grille de pixelisation et la position de superposition de cette grille sur le texte (les variantes de d\u00e9calage de la grille sont examin\u00e9es automatiquement).

\"Unredacter<\/center> <\/p>\n

On peut \u00e9galement noter le projet DepixHMM, dans le cadre duquel une variante de l'outil Depix, traduite sur la base d'un algorithme utilisant un mod\u00e8le de Markov cach\u00e9, a \u00e9t\u00e9 pr\u00e9par\u00e9e, ce qui a permis d'am\u00e9liorer la pr\u00e9cision de la reconstruction des caract\u00e8res.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u0435 \u0443\u0442\u0438\u043b\u0438\u0442\u044b, \u0442\u0430\u043a\u0438\u0435 \u043a\u0430\u043a Depix, \u0438 \u0432 \u0442\u043e\u043c \u0447\u0438\u0441\u043b\u0435 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d \u0434\u043b\u044f \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0442\u0435\u0441\u0442\u0430 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