https://www.bbc.com/future/article/20210324-the-hidden-fingerprint-inside-your-photos
A very informative article about the hidden info in digital photos, that cameras take.
Most people know about the hidden meta data stored in a digital photo but there is also info that can be gleaned from the individual photon receptors in each photo sensor chip of individual cameras.
It is like how a gun can be identified, by the scratch marks on a bullet, from a gun, that the gun barrel makes.
Each digital camera photo sensor has millions of photo receptors, that each produce a charge when a photon hits the receptor. No two photo sensors are alike, in the amount of charge that gets produced, when a photon strikes a photo receptor. The different charge produced, between photo sensors is very small, but that difference can be used to identify an individual camera and the images it takes.
Fascinating article. It alludes to the way that printers can also be identified via their printouts, as well, something I mentioned in another post. It's quite interesting that they actually used it to find McAfee. I believe he's wanted for murder unless I'm mistaken. Definitely, good use of this information in that case, unless you're McAfee!