Steganographic system
DC CAFCFirst Claim
Patent Images
1. A paper medium having steganographically encoded data stored therein, the steganographically encoded data being produced in accordance with the following method:
- providing first and second signals;
modulating the first signal with the second to produce a third signal, wherein the second signal cannot be discerned from the third signal without the first signal;
shaping the surface micro-topology of the paper medium in accordance with the third signal.
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Abstract
An identification code signal is impressed on a carrier to be identified (such as an electronic data signal or a physical medium) in a manner that permits the identification signal later to be discerned and the carrier thereby identified. The method and apparatus are characterized by robustness despite degradation of the encoded carrier, and by permeation of the identification signal throughout the carrier.
679 Citations
37 Claims
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1. A paper medium having steganographically encoded data stored therein, the steganographically encoded data being produced in accordance with the following method:
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providing first and second signals; modulating the first signal with the second to produce a third signal, wherein the second signal cannot be discerned from the third signal without the first signal; shaping the surface micro-topology of the paper medium in accordance with the third signal.
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2. A method of texturing a surface of a physical medium to provide identification markings thereon, the method comprising:
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providing first and second signals, the first signal being a pseudo-random noise signal; modulating the first signal with the second to produce a third signal, wherein the second signal cannot be discerned from the third signal without the first signal; shaping the surface micro-topology of the physical medium in accordance with the third signal. - View Dependent Claims (7, 14, 19)
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3. A method of texturing a surface of a physical medium to provide identification markings thereon, the method comprising:
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providing first and second signals, the second signal being a binary signal having "1" and "0" states; modulating the first signal with the second to produce a third signal, wherein the second signal cannot be discerned from the third signal without the first signal; shaping the surface micro-topology of the physical medium in accordance with the third signal, wherein the modulating includes multiplying successive portions of the first signal by first or second multiplicands depending on a binary value of the second signal corresponding thereto. - View Dependent Claims (4, 5, 6, 8)
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9. A method of processing a light sensitive medium prior to exposure, comprising:
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generating an image having auxiliary data steganographically encoded therein; and exposing the light sensitive medium with said image at an exposure level that does not impair subsequent use of the medium for imaging. - View Dependent Claims (10, 11, 12)
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13. A method of steganographically encoding a set of source data with a set of auxiliary data, each of said sets of data comprising a plurality of elements, the method including:
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(a) providing a set of independent data, said set of independent data being independent both of the set of auxiliary data and of the set of source data, the set of independent data comprising a plurality of elements; (b) processing one element of said set of independent data in accordance with a corresponding element of the set of auxiliary data to produce a processed datum; (c) combining the processed datum with an element of said set of source data to produce an encoded datum, said combining including performing a binary addition operation between the processed data and said element of source data; and (d) repeating steps (b) and (c) for other elements of the sets of independent, auxiliary data, and source data, thereby producing a set of encoded data. - View Dependent Claims (15, 16, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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17. A steganographic encoding method comprising:
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providing a set of digital data, said set comprising M bytes, each byte including N bits B1, B2, B3, B4 . . . BN, where B1 is a least significant bit and BN is a most significant bit; providing a set of overlay data comprising M elements; and adding to each byte of the set of digital data an element of the overlay data corresponding thereto, said adding serving to change a majority of bytes in the set of digital data, said addition rippling up the bits of various of said bytes to change bit B4 in at least certain of said bytes, wherein detectable artifacts of the steganographic encoding persist even if the three least significant bits of each encoded byte are entirely corrupted. - View Dependent Claims (18)
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Specification