Scientists from the University of Roma Tre in Italy have developed a way to tell if an original digital image has been changed to reflect, oh, I dunno, Tom Cruise naked or Pamela Anderson with tiny breasts. A computer generated hologram is watermarked into an image’s bits and bytes. If the original image is then tampered with, those with the encryption key can go in and pull the CGH back out.
The CGH is added as random, high frequency noise that can’t be detected by the naked eye. This hologram is based on light patterns made by a real hologram, so it’s much smaller than the original.

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