Stealthy secret key encoding and decoding

Details Stealthy secret key encoding and decoding Stealthy secret key encoding and decoding

2007-11-27

2007-11-27

Johns, Andrew W. (Department: 2624)

Image analysis

Applications

C713S176000

Reexamination Certificate

active

10716993

ABSTRACT:
An implementation is described herein facilitates certification of goods and/or identifications of the source of such goods. At least one implementation, described herein, embeds a watermark into a relatively small amount of data in a deterministic manner. At least one implementation, described herein, generates an authentication transformation matrix based, at least in part, upon an authentication watermark and a pre-defined humanly perceptible authentication pattern (e.g., image, audio). With this implementation, it obtains subject goods that may have the authentication watermark embedded therein. It generates a humanly perceptible resultant pattern (e.g., image, audio) based, at least in part, upon the watermark detected in subject goods and the transformation matrix. If the detected watermark is the authentication watermark, then the resultant pattern and the pre-defined authentication pattern will match (or nearly so). At least one implementation, described herein, hides a secret key around the periphery of watermarked goods. This abstract itself is not intended to limit the scope of this patent. The scope of the present invention is pointed out in the appending claims.

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Busch, et al., “Sensitivity Labels and Invisible Indentification Markings in Human-Readable Output”, SPIE, vol. 4675, 2002, pp. 149-157.
Wang, et al., “Embedding Digital Watermarks in Halftone Screens”, SPIE, vol. 3971, 2000, pp. 218-228.
Yeung, et al., “An Invisible Watermarking Technique For Image Verification”, IEEE, vol. 2, 1997, pp. 680-684.

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