80% of visits to Tor hidden services relate to child sex abuse, study suggests

This is disturbing if the findings hold up. It relates to Tor hidden services, importantly, not Tor as a whole. Still. Wired reports:

The mysterious corner of the Internet known as the Dark Web is designed to defy all attempts to identify its inhabitants. But one group of researchers has attempted to shed new light on what those users are doing under the cover of anonymity. Their findings indicate that an overwhelming majority of their traffic is driven by the Dark Web's darkest activity: the sexual abuse of children.

At the Chaos Computer Congress in Hamburg, Germany today, University of Portsmouth computer science researcher Gareth Owen will present the results of a six-month probe of the web's collection of Tor hidden services, which include the stealthy websites that make up the largest chunk of the Dark Web. The study paints an ugly portrait of that Internet underground: drug forums and contraband markets are the largest single category of sites hidden under Tor's protection, but traffic to them is dwarfed by visits to child abuse sites. More than four out of five Tor hidden services site visits were to online destinations with pedophilia materials, according to Owen's study. That's over five times as many as any of the other categories of content that he and his researchers found in their Dark Web survey, such as gambling, bitcoin-related sites or anonymous whistle-blowing.

I believe the video of the presentation is available here starting at the 16-minute mark. The Tor Project blog has some responses, including here (from Nick Matthewson) and here.