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Digital Cameras Leave Unique 'Pixel' Fingerprints: Page 2 of 2

In higher-tech office machines, Xerox has developed DocuColor, a forensic tracking codes that prints tracking dots on color documents.

As for Fridrich's technique, the Binghamton University statement said it promises to find applications in the analysis of scanned and video imagery. "We already know law enforcement wants to be able to use this," Fridrich said, in the statement. "What we have right now is a research tool; it's a raw technology that we will continue to improve."

Security expert Bruce Schneier, writing on his blog, points out one potential weakness of the method. "There's one important aspect of this fingerprint that the article did not talk about: how easy is it to forge?" Schneier wrote. "Can someone analyze 100 images from a given camera, and then doctor a pre-existing picture so that it appeared to come from that camera?"