> Unlike printers, every typewriter had its own individual typing pattern which made it possible to link every document to a particular machine Many printers h

> Unlike printers, every typewriter had its own individual typing pattern which made it possible to link every document to a particular machine Many printers have this capability. Researchers cracked and published one of the codes way back in 2005 [1] [2]. Whether the manufacturers would provide the coding scheme to Russian intelligence services is another question. [1] https://www.eff.org/issues/printers https://www.eff.org/issues/printers [2] http://en.wikipedia.org/wiki/Printer_steganography http://en.wikipedia.org/wiki/Printer_steganography