Researcher and computer security consultant, Neal Krawetz has some interesting analysis about dgtital alteration, and one of the things he has shown is how it can be applied to analyzing images from al Qaeda. Read the article at Wired.
“But more interesting were the examples Krawetz gave of al Qaeda images. Krawetz took an image from a 2006 al Qaeda video of Ayman al-Zawahiri, a senior member of the terrorist organization. The image shows al-Zawahiri sitting in front of a desk and banner with writing on it. But after conducting his error analysis Krawetz was able to determine that al-Zawahiri’s image was superimposed in front of the background — and was most likely videotaped in front of a black sheet.”