One way the government could finger a leaker is through digital watermarking of the documents themselves. James Goldman, a cyber forensics expert at Purdue University, says it's not clear whether the government uses digital watermarking, "but it's certainly possible."Read the full story at Technology Review.
Such watermarks would consist of hidden digital data--or even slight alterations in the pattern of words--added to documents in ways that are hard to detect, but are readily decodable with the right software.
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