Re: [privacy] Digital Camera Fingerprints

["Fergie" <fergdawg () netzero net>]

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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