Forensics v. Photoshop

On 2012.09.22 04:48 , Eric Stevens wrote:

Having looked at Wikipedia on the subject I've come away more than a
little gob-smacked. There are so many ways to construct a JPG file it
would be surprising if any two cameras produced identical finger
prints from their files.

But any given camera co. probably re-uses the same algorithms
(generally) over time so they would be similar or exactly the same over
dozens and dozens of models.

That isn't what (or solely what) this software purports to do. Rather
it looks at fine grained differences in the actual image data to
fingerprint the effects of its sensor/d-a/n-r circuits/algorithms. That
will not be common from a given manufacturer except for a few closely
related variations of a model.


--
"There were, unfortunately, no great principles on which parties
were divided – politics became a mere struggle for office."
-Sir John A. Macdonald