Printer Steganography

Printer Services Newsletter 7.2

We all know about the obvious things companies do to stop or track piracy of their products. Clear plastic windows, embedded metal strips and other security devices. There are also the hidden ones that are not as well known and equally as important to their efforts. One of these is printer steganography, let’s learn more.


Printer Steganography

Printer steganography is a type of steganography – "hiding data within data" where tiny yellow dots are added to each page. The dots are barely visible and contain encoded printer serial numbers and timestamps. Unlike many forms of steganography, the hidden information is not intended to be available from a computer file, but to allow serial number and time of printing to be determined by close examination of a printout.

Printer Steganography Image

The Electronic Frontier Foundation stated in 2005 that "the documents that we previously received through a (Freedom of Information Request) suggested that all major manufacturers of color laser printers entered a secret agreement with governments to ensure that the output of those printers is forensically is probably safest to assume that all modern color laser printers do include some form of tracking information that associates documents with the printer's serial number."

Why they put the dots there.

During the 1990s Xerox and other companies sought to reassure governments that their printers would not be used for forgery. The identification is by means of a watermark, often using yellow-on-white, embedded in the printout of each page, and in conjunction with other information can be used to identify the printer which was used to print any document originally produced on a wide range of popular printers. It has been reported that monochrome printers and copiers from major manufacturers also include the markings. It may be actual text, or a repeated pattern of dots throughout the page, more easily visible under blue light or with a magnifying glass, and is intended to produce minimal visible change to the printout, ideally being imperceptible to the naked eye.