Fortunately, Some steps are being taken to combat this kind of digital deception. Corbis, the online stock photo agency, places an imperceptible digital watermark on the 100 million images if makes available , which encodes information about the owner of the image within the pixels of the photograph and can be traced even if the image has been modified.
In another technique, Dartmouth College computer science professor Hany Farid has codeveloped a program called PhotoDNA that can detect changes in photographic images.
Electrical and computer engineering professor Jessica Fridrich, of the State University of New York at Binghamton, is doing research in which a digital camera would take a picture of a subject and at the same time a picture of the photographer’s iris, a distinctive form of identification, that would be hidden inside the larger picture just taken.