{"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\/sv\/blog\/news\/predstavlen-unredacter-instrument-dlya-opredeleniya-pikselizirovannogo-teksta","title":{"rendered":"Unredacter har presenterats, ett verktyg f\u00f6r att identifiera pixelerad text","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Verktyget Unredacter har presenterats, vilket g\u00f6r det m\u00f6jligt att \u00e5terst\u00e4lla den ursprungliga texten efter att den har dolts med hj\u00e4lp av pixeleringsfilter. Programmet kan till exempel anv\u00e4ndas f\u00f6r att identifiera konfidentiell information och l\u00f6senord som har pixelerats p\u00e5 sk\u00e4rmdumpar eller bilder av dokument. Det p\u00e5st\u00e5s att algoritmen som implementerats i Unredacter \u00f6vertr\u00e4ffar tidigare tillg\u00e4ngliga liknande verktyg, s\u00e5som Depix, och har framg\u00e5ngsrikt anv\u00e4nts f\u00f6r att klara testet f\u00f6r att identifiera pixelerad text, vilket f\u00f6reslagits av Jumpsec-laboratoriet. Programkoden \u00e4r skriven i TypeScript och distribueras under GPLv3-licensen. <\/p>\n

F\u00f6r att \u00e5terst\u00e4lla text i Unredacter anv\u00e4nds en metod f\u00f6r backtracking, d\u00e4r en del av den ursprungliga pixelerade bilden j\u00e4mf\u00f6rs med en variant som syntetiseras genom att pr\u00f6va olika teckenpar som pixeleras med olika skift och \u00e4ndrade egenskaper. Under pr\u00f6vningen v\u00e4ljs gradvis en variant som \u00e4r n\u00e4rmast den ursprungliga fragmentet. F\u00f6r att det ska fungera korrekt kr\u00e4vs det att man gissar storlek, typ och avst\u00e5ndsegenskaper f\u00f6r typsnittet, samt ber\u00e4knar storleken p\u00e5 cellen i pixeleringsrutn\u00e4tet och positionen f\u00f6r \u00f6verlagring av detta rutn\u00e4t p\u00e5 texten (varianter av skift i rutn\u00e4tet provas automatiskt).

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

Det kan ocks\u00e5 n\u00e4mnas projektet DepixHMM, d\u00e4r en variant av verktyget Depix har f\u00f6rberetts och \u00f6versatts till en algoritm baserad p\u00e5 en dold Markovmodell, vilket har lett till en \u00f6kad noggrannhet i \u00e5terst\u00e4llandet av tecken.
\n
K\u00e4lla: 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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