Re: [privacy] Digital Camera Fingerprints

["Andrew Blair" <Andrew.Blair () genmills com>]

Another interesting application would be altering one photograph to
match the "unique" signature of another camera. If you were really out
for revenge you could find that child pr0n and match it to a digital
camera owned by the target. Tip off the fuzz and they could have a lot
of explaining to do.

AB

-----Original Message-----
From: Fergie [mailto:fergdawg () netzero net] 
Sent: Monday, April 24, 2006 11:08 AM
To: jpolazzo () thesportsauthority com
Cc: privacy () whitestar linuxbox org
Subject: Re: [privacy] Digital Camera Fingerprints

Be on the lookout for tools to "de-fingerprint" digital images --
software which can remove unique pixalization characteristics of images
related to a given digital camera without significantly degradinging the
image quality. :-)

In fact, one would think that any given steganography software would
already suffice:

 http://www.jjtc.com/Steganography/

- ferg


-- "Justin Polazzo" <jpolazzo () thesportsauthority com> wrote:

 http://www.boingboing.net/2006/04/22/digital_cameras_have.html

Digital cameras have unique "noise" fingerprints?
A researcher at SUNY Binghamton reports that he can tell which camera
took any given photo by matching the photo's unique "weak noise-like
pattern of pixel-to-pixel non-uniformity."

    Like actual fingerprints, the digital "noise" in original images is
stochastic in nature - that is, it contains random variables - which are
inevitably created during the manufacturing process of the camera and
its sensors. This virtually ensures that the noise imposed on the
digital images from any particular camera will be consistent from one
image to the next, even while it is distinctly different.

    In preliminary tests, Fridrich's lab analyzed 2,700 pictures taken
by nine digital cameras and with 100 percent accuracy linked individual
images with the camera that took them. 


--------------------------------

I can think of good and bad uses for this technology (as with all), but
the idea of being able to tell who is _taking_ the child pr0n pictures
is pretty enticing.

-JP


--
"Fergie", a.k.a. Paul Ferguson
 Engineering Architecture for the Internet  fergdawg () netzero net or
fergdawg () sbcglobal net  ferg's tech blog: http://fergdawg.blogspot.com/

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