Digital image authentication from thumbnails
Eric Kee, Hany Farid · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2010
We describe how to exploit the formation and storage of an embedded image thumbnail for image authentication. The creation of a thumbnail is modeled with a series of filtering operations, contrast adjustment, and compression. We automatically estimate these model parameters and show that these parameters differ significantly between camera manufacturers and photo-editing software. We also describe how this signature can be combined with encoding information from the underlying full resolution image to further refine the signature's distinctiveness.