Method and system for sustainable digital watermarking

Details Method and system for sustainable digital watermarking Method and system for sustainable digital watermarking

H - Electricity

04

L

H04L 9/32 (2006.01) G06F 12/14 (2006.01) G06F 21/00 (2006.01)

Patent

CA 2449595

Digital marks (so-called fingerprints and watermarks) serve two basic purposes: (1) Investigative: the owner reads a fingerprint to determine how the marked entity leaked; and (2) Legal: the owner must prove in court that (a) there is a watermark (a concealed copyright message), and (b) it is the owner's. The main difficulty of item (2) is that the first use of the watermark software reveals the watermarking method to the public so that hostile parties are equipped to remove or damage its watermarks. The invention uses tamper-resistant software encoding techniques to protect the digital mark extractor algorithm, frustrating the attacks of hostile parties in two ways: the resulting code is obscure (that is, its inner workings are incomprehensible; and chaotic (that is, a modification at any point will almost certainly produce a nonsense program.

Selon l'invention, les empreintes numériques (telles que les empreintes digitales ou les filigranes) servent principalement deux objets: 1) une utilisation à des fins d'investigation: le propriétaire lit une empreinte digitale afin de déterminer comment l'entité marquée a transpiré; et 2) une utilisation à des fins légales: le propriétaire doit prouver au tribunal que: a) il existe un filigrane (un message de droit d'auteur caché) et b) il en est l'auteur. La principale difficulté liée au point 2) est que la première utilisation du logiciel stéganographique révèle au public le procédé stéganographique, ce qui donne à des tiers hostiles la possibilité d'enlever ou d'endommager un filigrane. Le procédé de l'invention met en oeuvre des techniques de codage par logiciel infalsifiables pour protéger l'algorithme d'extraction de la marque numérique, ce qui décourage doublement les attaques de tiers hostiles: le code résultant est opaque (son fonctionnement interne est incompréhensible) et instable (toute modification à un point quelconque produit quasi inéluctablement un programme incohérent).

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