I am also an IT Security guy and there is no possible secure way to prove the creation date of any file if the user controls the system creating the file with current technology that I am aware of. It is possible (if the author wants to) to prove that a file existed prior to a given time by signing the file from a third party time stamping server (through which the third party proves that the file existed at the time of the signing) but such information is not automatically possible and can easily be stripped. It is sadly impossible to to prove when an image (or any file for that matter) originated.
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