Importance

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Abstract

A method is presented for decoding auxiliary information in digital images which enables the encoding of both compact auxiliary information specific to a given image and a secret message into a given image such that the hidden message contained therein is only revealed in such a way that neither the image itself nor the auxiliary information alone are sufficient to reveal the secret message. Specifically, a method for decoding an auxiliary message in a digital image, having the steps of first receiving a function F through secure means; then, for each pixel (i,j) in digital image (D) obtaining a N.times.N windowed observation; applying function F to said N.times.N windowed observation; marking a corresponding pixel in message (I) with the value obtained from function F; and then writing out the hidden message.

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First Claim