Utilizing data reduction in steganographic and cryptographic system
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Abstract
The present invention relates to methods for protecting a data signal using the following techniques: applying a data reduction technique to reduce the data signal into a reduced data signal; subtracting the reduced data signal from the data signal to produce a remainder signal; embedding a first watermark into the reduced data signal to produce a watermarked, reduced data signal; and adding the watermarked, reduced data signal to the remainder signal to produce an output signal. A second watermark may be embedded into the remainder signal before the final addition step. Further, cryptographic techniques may be used to encrypt the reduced data signals and to encrypt the remainder signals before the final addition step. The present invention also relates to a system for securing a data signal including: computer devices for applying a data reduction technique to reduce the data signal into a reduced data signal; means to subtract the reduced data signal from the data signal to produce a remainder signal; means to apply a first cryptographic technique to encrypt the reduced data signal to produce an encrypted, reduced data signal; means to apply a second cryptographic technique to encrypt the remainder signal to produce an encrypted remainder signal; and means to add the encrypted, reduced data signal to the encrypted remainder signal to produce an output signal.
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Citations
133 Claims
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1-108. -108. (canceled)
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109. A system for securing a data signal comprising:
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a first processor coupled to a memory to apply a data reduction technique to reduce the data signal into a reduced data signal; a subtractor to subtract said reduced data signal from the data signal to produce a remainder signal; a second processor to apply a first cryptographic technique to encrypt the reduced data signal to produce an encrypted, reduced data signal; a third processor apply a second cryptographic technique to encrypt the remainder signal to produce an encrypted remainder signal; and an adder to add said encrypted, reduced data signal to said encrypted remainder signal to produce an output signal. - View Dependent Claims (110, 111, 112, 113, 114, 115)
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116. A system for securing a data signal comprising the steps of:
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an analyzer for evaluating the data signal to determine its characteristics and reducibility; a selector for selecting at least one appropriate data reduction technique for the data signal; a processor coupled to a memory to apply said at least one appropriate data reduction technique; an encoder for encoding at least one digital watermark in the data signal or data reduced signal; and an output for supplying an output signal corresponding to the data signal. - View Dependent Claims (117, 118, 119, 120, 121, 122, 123, 124)
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125. A system for protected distribution of a data file comprising:
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(a) an encoder for encoding one or more digital watermarks in the data file using data reduction techniques in creating said digital watermark, wherein the use of data reduction techniques comprises creation of a reduced portion of the data file and a remainder portion of the data file; (b) and a transmission device for distributing the digitally watermarked file to an end user. - View Dependent Claims (126, 127, 130, 131, 132, 133)
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128-1. The system of claim 128, wherein said step of distributing with a transmission device comprises distributing over a public data network.
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129. The system of claim 129, wherein said public data network comprises the internet.
Specification