Method and apparatus for embedding authentication information within digital data
First Claim
Patent Images
1. A method for embedding information into image data representative of an image, comprising the steps of:
- a) providing image data representative of an image, said image data comprising digital data blocks including image luminance components of the image represented by said image data;
b) providing a bit string of information for encoding knowledge of interest to a receiver of said digital data blocks; and
c) processing said image data and said bit string by both a data embedding step and an encryption step to provide modified image data having said bit string embedded and encrypted therein, said data embedding step being performed by modifying said image luminance components with said bit string of information in a manner so that said bit string is not readily noticeable when said modified image data is converted into a non-digital form.
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Abstract
Arbitrary digital information is embedded within a stream of digital data, in a way that avoids detection by a casual observer and that allows a user to determine whether the digital data have been modified from their intended form. The embedded information may only be extracted as authorized and may be used to verify that the original digital data stream has not been modified.
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Citations
43 Claims
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1. A method for embedding information into image data representative of an image, comprising the steps of:
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a) providing image data representative of an image, said image data comprising digital data blocks including image luminance components of the image represented by said image data; b) providing a bit string of information for encoding knowledge of interest to a receiver of said digital data blocks; and c) processing said image data and said bit string by both a data embedding step and an encryption step to provide modified image data having said bit string embedded and encrypted therein, said data embedding step being performed by modifying said image luminance components with said bit string of information in a manner so that said bit string is not readily noticeable when said modified image data is converted into a non-digital form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for embedding information into image data representative of an image, comprising the steps of:
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a) providing image data representative of an image, said image data comprising digital data blocks including image luminance components of the image represented by said image data; b) providing a bit string of information for encoding knowledge of interest to a receiver of said digital data block; c) encrypting said bit string of information to provide an encrypted bit string; and d) embedding said encrypted bit string of information in said digital data blocks by modifying said image luminance components with said encrypted bit string of information. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification