Originally Posted By: ki4buc
First, most of the newer cards today use encryption to store the actual photo to the portable disk. When you "decrypt" the file you get an image. As long as you cannot write back to the disk an image from outside the camera at anytime, then it is as good as a fingerprint. If you can, then you won't be able to guarantee the authenticity of the digital photograph.

Second, all new digital cameras have a timestamp function. Make sure the date and time are correct.


But even the timestamp isn't always necessary. Cameras also write meta information attached to the file itself -- the date/time, exposure settings and model number. I suppose someone could photoshop a timestamp pretty easily but then they would also have to edit the meta information.