H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/00 (2006.01)
Patent
CA 2364432
A device (10) for hiding information in a text comprises means (12) for providing the text, means (18) for linguis- tically analyzing the text to produce text components, means (20) for determining a plurality of formulation al- ternatives for the text by varying the order of the text components and optionally in addition by using synonyms for said text components; every formulation alternative is grammatically correct for the text and has essentially the same meaning as the text. Certain partial information is allocated to every sequence and/or to every synonym or to every paraphrase. The device further comprises means (22) for selecting a formulation alternative from the plurality of formulation alternatives in such a manner that the par- tial information that is allocated to the selected formula- tion corresponds to the information to be hidden, and means (24) for outputting the formulation alternative that forms a modified text, said modified text containing information to be hidden. A device for extracting breaks the modified text down into its text components and uses the partial in- formation allocated to said text components to extract the hidden information. Information to be hidden can thus be flexibly and inconspicuously, as well as in large amounts, introduced into any text.
L'invention concerne un dispositif (10) permettant de cacher des informations dans un texte, qui comprend: un moyen (12) permettant de fournir le texte; un moyen (18) permettant d'effectuer l'analyse linguistique du texte de façon à en fournir les différentes composantes; un dispositif (20) permettant de déterminer pour le texte une pluralité d'alternatives de formulation en faisant varier l'ordre de succession desdites composantes et éventuellement en utilisant leurs synonymes, chaque alternative de formulation étant grammaticalement juste et ayant sensiblement le même sens, et chaque ordre de succession et/ou synonyme ou chaque paraphrase étant associé à certaines informations partielles; un moyen (22) permettant de choisir une alternative de formulation parmi la pluralité d'alternatives, de façon que les informations partielles associées à la formulation choisie correspondent aux informations à cacher; et un moyen (24) permettant de fournir une alternative de formulation qui constitue un texte modifié contenant les informations à cacher. L'invention concerne également un dispositif d'extraction, qui subdivise le texte modifié en ses différentes composantes et qui utilise les informations partielles associées à ces composantes pour extraire les informations cachées. Ce procédé permet d'introduire dans n'importe quel texte, d'une manière souple et discrète, de grandes quantités d'informations à cacher.
Mccarthy Tetrault Llp
Potter Thomas
LandOfFree
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