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Technology

Automating the hunt for child pornographers

By Peter Aldhous

6 April 2011

Âé¶¹´«Ã½. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Can software stop exploitation?

(Image: Alessandra Tarantino/AP/PA)

Algorithms that can quickly match images or even help identify their origin are being deployed to track down criminals who trade in child pornography

CHARLES M. JOHNSON JR is today in a US federal jail for producing child pornography. His conviction came thanks to a sharp-eyed investigator at the (NCMEC) in Arlington, Virginia, who spotted that two images among the millions received by the centre each year showed different pre-pubescent girls being sexually assaulted on the same distinctive bedspread.

“We identified the manufacturer of the bedspread, and where it was sold,”…

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