Not so long ago, those who trafficked in pornographic images of children kept to the shadows, operating their nefarious business far from mainstream channels. Then along came the Internet. The advent of instant publishing and file sharing has opened a global e-marketplace for child porn, with law enforcement lagging far behind tech-savvy traffickers.

Hany Farid, a computer scientist from Dartmouth College, was appalled to learn that not only is this illicit business booming, “but the children...


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