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David Kriesel: Traue keinem Scan, den du nicht selbst gefälscht hast
media.ccc.de

David Kriesel's 31C3 talk, in German, on the discovery that Xerox scanner-copiers silently replace digits and letters in scanned documents. He explains how the bug stayed unnoticed in the wild for years.
Called a classic CCC talk, and the Xerox bug is cited as a cautionary tale about trusting scans and digitized archives.
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