A 2018 open-access paper in the Egyptian Journal of Forensic Sciences shows how yellow tracking dots embedded in Xerox color laser printouts can be extracted with Adobe Photoshop CC 2018 and used to identify the source printer. The authors scanned 91 printouts from 22 Xerox printers and multifunction devices, then isolated the hidden machine-identification code (MIC) by separating color channels and enhancing the blue channel.
Why it matters:
this is a reminder that “ordinary” office equipment can leave behind covert, machine-specific traces. In forensic terms, a printed page may carry a built-in provenance marker; in security terms, that means printouts are not as anonymous as some people might assume.
Key technical takeaways:
• Xerox printouts contained a repeated coded dots matrix, with regular horizontal and vertical patterns that differed by printer model and helped distinguish one device from another.
• The embedded pattern could reveal time, date, and serial-number information depending on the device type, especially on multifunction printers.
• The authors argue that Photoshop CC 2018 can act as a nondestructive steganalysis tool for exposing these hidden printer markers.
• Their conclusion is strong: they report successful identification of Xerox printer identity and uniqueness with 100% accuracy in their study set.
Practical implications:
• Treat printouts as potentially attributable artifacts, not anonymous paper.
• In investigations, preserve originals and avoid unnecessary image processing before forensic review.
• For sensitive environments, review printer models, retention policies, and document handling workflows.
• If your organization relies on printers for confidential material, understand that the device itself may encode provenance information.
Source: https://link.springer.com/article/10.1186/s41935-018-0076-4
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