As the ability to manipulate digital image media becomes more common, our understanding of technological, ethical and legal implications is lagging. At the General Meeting in April, Prof. Hany Farid of Dartmouth College discussed some of these issues and described computational techniques which have been developed for detecting such tampering. Operating in the absence of digital watermarks or signatures, these techniques quantify and detect statisical, optical and geometric correlations that result from specific forms of digital tampering.