Printers betray document secrets

Rich Salz rsalz at
Thu Oct 21 12:27:50 EDT 2004

> >  US scientists have discovered that every desktop printer has a signature
> > style that it invisibly leaves on all the documents it produces.
> I don't think this is new - I'm pretty sure it was
> published about 6 or 7 years back as a technique.

A couple of years ago, I was told that *every* Canon laser engine
generated a unique microprint signature that could be traced back to a
particular device.  OEMs could buy the engine with or without the
signature.  If so, this has been going on, surruptitiously, for years.

Rich Salz                  Chief Security Architect
DataPower Technology
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