Originally posted by WendyB Duh, Patent office, It really is quite a bit more sophisticated than you my lead yourself to beleive.
I apologize for this flame in advance.
Not a flame at me to be sure - you have flamed yourself. Here are two sites taking about a technique developed in ----- 2006 ----- (wasn't 9/11 in 2001?) that is was going to be patented. So where is the patent? It is in the works and the technique was developed 5 years after we were attacked. It seems that a method of use has not gone beyond the research stage.
Digital Camera Fingerprints | TeamDroid Digital camera 'fingerprinting' developed
But I have loved the one here:
Digital cameras leave 'fingerprints' on their snaps - forensic-science - 24 April 2006 - New Scientist Tech
And I quote:
"Markus Kuhn, a computer security researcher at the University of Cambridge, UK, says the technique is "extremely interesting" and will appeal to digital forensics experts within law enforcement.
But Kuhn notes that sophisticated digital cameras could be more problematic to trace. Kuhn's own research shows that some types of camera are calibrated in the factory to reduce sensor noise: "
Good cameras store data on how the sensitivity of individual pixels varies and software compensates each image accordingly."
So the technique works --- only if you have turned off noise reduction or have a manufacturer too dumb to figure out how to maximize their output. And it would work on the so called K20 images --- if you suspect that the K20 is NOT a sophisticated digital camera (see highlighted text above).
This whole set of statements is just unbelievable - how/why would a CCD/CMOS fib facility in say --- China or Indonesia (a Muslim country) --(and they really may not like us)-- provide the US government with this information? In the first two articles they mention EXIF information (and I am a big fan of EXIF), but EXIF can be stripped -- clean out of JPEGS -=> nothing to track with there. (Adobe does this by default when "saving for the web" but then again, I always thought Adobe was part of 'the' conspiracy)
Now if these guys have managed to figure out a way to take a 8 bit JPEG image and recreate the 14 bit RAW file (to get the "full fingerprint") I say bring it on - now that would be very cool.
The Elitist - formerly known as PDL