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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.

Vodafone, one of the world's largest mobile phone groups, has revealed the existence of secret wires that allow government agencies to listen to all conversations on its networks, saying they are widely used in some of the 29 countries in which it operates in Europe and beyond.The company has broken its silence on government surveillance in order to push back against the increasingly widespread use of phone and broadband networks to spy on citizens, and will publish its first Law Enforcement Disclosure Report on Friday. At 40,000 words, it is the most comprehensive survey yet of how governments monitor the conversations and whereabouts of their people.The company said wires had been connected directly to its network and those of other telecoms groups, allowing agencies to listen to or record live conversations and, in certain cases, track the whereabouts of a customer. Privacy campaigners said the revelations were a "nightmare scenario" that confirmed their worst fears on the extent of snooping.

Vodafone's group privacy officer, Stephen Deadman, said: "These pipes exist, the direct access model exists."We are making a call to end direct access as a means of government agencies obtaining people's communication data. Without an official warrant, there is no external visibility. If we receive a demand we can push back against the agency. The fact that a government has to issue a piece of paper is an important constraint on how powers are used."Vodafone is calling for all direct-access pipes to be disconnected, and for the laws that make them legal to be amended. It says governments should "discourage agencies and authorities from seeking direct access to an operator's communications infrastructure without a lawful mandate".

In America, Verizon and AT&T have published data, but only on their domestic operations. Deutsche Telekom in Germany and Telstra in Australia have also broken ground at home. Vodafone is the first to produce a global survey.