Printers betray document secrets

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Printers betray document secrets
http://news.bbc.co.uk/2/low/technology/3753886.stm

That staple of crime novels - solving a case by identifying the typewriter 
used to write a ransom note - is being updated for the modern day.
US scientists have discovered that every desktop printer has a signature 
style that it invisibly leaves on all the documents it produces.
They have now found a way to use this to identify individual laser printers.
The work will help track down printers used to make bogus bank notes, fake 
passports and other important papers.

Spot colour
Before now it was thought that the differences between cheap, mass-produced 
desktop printers were not significant enough to make individual 
identification possible. Before now it was thought that the differences 
between cheap, mass-produced desktop printers were not significant enough 
to make individual identification possible.

But a team from Purdue University in Indiana led by Professor Edward Delp 
has developed techniques that make it possible to trace which printer was 
used to produce which document.

snip

"To be really safe, I'd suggest going somewhere without surveillance 
cameras, buying a printer for cash, using it and then destroying it.
Don't forget not to use your car and leave your mobile phone behind. Oh, 
and take the RFID tags out of your clothes."
- annonymous


The Magic of RFID
ACM Queue vol. 2, no. 7 - October 2004
by Roy Want, Intel Research
Just how do those little things work anyway?
Radio Frequency Identification
http://www.acmqueue.com/modules.php?name=Content&pa=showpage&pid=216
Many modern technologies give the impression they work by magic, 
particularly when they operate automatically and their mechanisms are 
invisible. A technology called RFID (radio frequency identification), which 
is relatively new to the mass market, has exactly this characteristic and 
for many people seems a lot like magic. RFID is an electronic tagging 
technology (see figure 1) that allows an object, place, or person to be 
automatically identified at a distance without a direct line-of-sight, 
using an electromagnetic challenge/response exchange. Typical applications 
include labeling products for rapid checkout at a point-of-sale terminal, 
inventory tracking, animal tagging, timing marathon runners, secure 
automobile keys, and access control for secure facilities.

see:
http://www.edu-cyberpg.com/Technology/SECURITY.html


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