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The debate over online anonymity, and all the whistleblowers, trolls, anarchists, journalists and political dissidents it enables, is messy enough. It doesn’t need the US government making up bogus statistics about how much that anonymity facilitates child pornography.

he debate over online anonymity, and all the whistleblowers, trolls, anarchists, journalists and political dissidents it enables, is messy enough. It doesn’t need the US government making up bogus statistics about how much that anonymity facilitates child pornography. At the State of the Net conference in Washington on Tuesday, US assistant attorney general Leslie Caldwell discussed what she described as the dangers of encryption and cryptographic anonymity tools like Tor, and how those tools can hamper law enforcement. Her statements are the latest in a growing drumbeat of federal criticism of tech companies and software projects that provide privacy and anonymity at the expense of surveillance. And as an example of the grave risks presented by that privacy, she cited a study she said claimed an overwhelming majority of Tor’s anonymous traffic relates to pedophilia. “Tor obviously was created with good intentions, but it’s a huge problem for law enforcement,” Caldwell said in comments reported by Motherboard and confirmed to me by others who attended the conference. “We understand 80 percent of traffic on the Tor network involves child pornography.” That statistic is horrifying. It’s also baloney.

In a series of tweets that followed Caldwell’s statement, a Department of Justice flack said Caldwell was citing a University of Portsmouth study WIRED covered in December. He included a link to our story. But I made clear at the time that the study claimed 80 percent of traffic to Tor hidden services related to child pornography, not 80 percent of all Tor traffic. That is a huge, and important, distinction. The vast majority of Tor’s users run the free anonymity software while visiting conventional websites, using it to route their traffic through encrypted hops around the globe to avoid censorship and surveillance. But Tor also allows websites to run Tor, something known as a Tor hidden service. This collection of hidden sites, which comprise what’s often referred to as the “dark web,” use Tor to obscure the physical location of the servers that run them. Visits to those dark web sites account for only 1.5 percent of all Tor traffic, according to the software’s creators at the non-profit Tor Project. The University of Portsmouth study dealt exclusively with visits to hidden services. In contrast to Caldwell’s 80 percent claim, the Tor Project’s director Roger Dingledine pointed out last month that the study’s pedophilia findings refer to something closer to a single percent of Tor’s overall traffic.