Steganographic embedding of data in digital signals

G - Physics – 06 – T

Patent

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G06T 1/00 (2006.01)

Patent

CA 2412984

A novel technique for high-bandwidth steganographic embedding of supplemental data in a series of digital signals or measurements, such as taken from analog data streams or subsampled and/or transformed digital data, wherein the series of measurements are derived through functional transformations and involving quantization and/or aliasing, with the supplemental data bits modulating or modifying the quantized and/or aliased components with only slight adjustments thereof to embed the supplemental data without substantially affecting the quality of the measurements; and all, preferably, through not exclusively, with the use of least-significant-bit parity encodig designed to choose the appropriate components to be so modulated or modified.

L'invention concerne une nouvelle technique destinée à l'inclusion stéganographique à largeur de bande élevée de données additionnelles dans une série de mesures ou de signaux numériques, et notamment de données issues de flots de données analogiques ou de données numériques sous-échantillonnées et/ou transformées. Cette série de mesures s'obtient au moyen d'opérations de transformation fonctionnelle impliquant une quantification et/ou un repliement, les bits des données additionnelles modulant ou modifiant les composants quantifiés et/ou repliés avec des réglages de faible importance, d'où la possibilité d'inclure des données additionnelles sans pour autant altérer la qualité des mesures. On effectue de préférence ces opérations au moyen d'un codage de parité du bit le moins significatif permettant de choisir les composants appropriés à moduler ou modifier de la sorte.

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