Hiding encrypted messages in information carriers
AssigneeDigimarc Corporation
InventorGeoffrey B. Rhoads
Life of this patent
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Abstract
An identification code signal is hidden in a carrier signal (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned. The carrier signal can thereby be identified, or some machine responsive action can thereby be taken. The technique can be applied in video imagery embodiments to control associated video equipment, e.g. to serve as a copy control signal.
Claims6
A method of hiding a message in an information carrier, the steps comprising:
- a) encrypting a message with the use of a scrambling function;
- b) choosing an information carrier comprising a set of pixels;
- c) coding the shade or color level of said encrypted message using a set of pixels in said information carrier;
- d) modifying said shade or color level of each of said pixels of said coded message by one of a plurality of values;
- and
- e) transmitting said modified message.
A method of steganographically hiding a message in an information carrier comprising:
- encrypting a message;
- modulating the encrypted message with predetermined data;
- scaling said modulated encrypted message;
- and
- adding the scaled, modulated encrypted message to the information carrier.
A method of hiding a message in an information carrier comprising:
- encrypting a message:
- modulating the encrypted message with predetermined data;
- scaling said modulated encrypted message;
- and
- adding the scaled, modulated encrypted message to the information carrier, wherein the information carrier comprises a video frame.
A method of hiding a message in an information carrier comprising:
- encrypting a message;
- modulating the encrypted message with predetermined data;
- scaling said modulated encrypted message;
- and
- adding the scaled, modulated encrypted message to the information carrier,
- wherein said scaling scales the brightness level of the modulated encrypted message.
A method of hiding a message in an information carrier comprising:
- encrypting a message;
- modulating the encrypted message with predetermined data;
- scaling said modulated encrypted message;
- and
- adding the scaled, modulated encrypted message to the information carrier,
- wherein said encrypting provides an encrypted message comprising a spatially uniform noisy message.
A method of hiding a message in an information carrier comprising:
- encrypting a message;
- modulating the encrypted message with predetermined data;
- scaling said modulated encrypted message;
- and
- adding the scaled, modulated encrypted message to the information carrier,
- wherein the predetermined data comprises an N-bit identification word.
Dependencies are inferred from the claim text.