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GCHQ vacuums up the website browsing histories using “probes” that tap into the international fiber-optic cables that transport Internet traffic across the world. A huge volume of the Internet data GCHQ collects flows directly into a massive repository named Black Hole, which is at the core of the agency’s online spying operations, storing raw logs of intercepted material before it has been subject to analysis. Black Hole contains data collected by GCHQ as part of bulk “unselected” surveillance, meaning it is not focused on particular “selected” targets and instead includes troves of data indiscriminately swept up about ordinary people’s online activities. Between August 2007 and March 2009, GCHQ documents say that Black Hole was used to store more than 1.1 trillion “events”  a term the agency uses to refer to metadata records  with about 10 billion new entries added every day. As of March 2009, the largest slice of data Black Hole held  41 percent  was about people’s Internet browsing histories. The rest included a combination of email and instant messenger records, details about search engine queries, information about social media activity, logs related to hacking operations, and data on people’s use of tools to browse the Internet anonymously.

Throughout this period, as smartphone sales started to boom, the frequency of people’s Internet use was steadily increasing. In tandem, British spies were working frantically to bolster their spying capabilities, with plans afoot to expand the size of Black Hole and other repositories to handle an avalanche of new data. By 2010, according to the documents, GCHQ was logging 30 billion metadata records per day. By 2012, collection had increased to 50 billion per day, and work was underway to double capacity to 100 billion. The agency was developing “unprecedented” techniques to perform what it called “population-scale” data mining, monitoring all communications across entire countries in an effort to detect patterns or behaviors deemed suspicious. It was creating what it saidwould be, by 2013, “the world’s biggest” surveillance engine “to run cyber operations and to access better, more valued data for customers to make a real world difference.” HERE WAS A SIMPLE AIM at the heart of the top-secret program: Record the website browsing habits of “every visible user on the Internet.” Before long, billions of digital records about ordinary people’s online activities were being stored every day. Among them were details cataloging visits to porn, social media and news websites, search engines, chat forums, and blogs.

The mass surveillance operation — code-named KARMA POLICE — was launched by British spies about seven years ago without any public debate or scrutiny. It was just one part of a giant global Internet spying apparatus built by the United Kingdom’s electronic eavesdropping agency, Government Communications Headquarters, or GCHQ. The revelations about the scope of the British agency’s surveillance are contained in documents obtained by The Intercept from National Security Agency whistleblower Edward Snowden. Previous reports based on the leaked files have exposed how GCHQ taps into Internet cables to monitor communications on a vast scale, but many details about what happens to the data after it has been vacuumed up have remained unclear.

“The specific uses that they talk about in this [counter-terrorism] context may not be the problem, but it’s what else they can do,” said Tamir Israel, a lawyer with the University of Ottawa’s Canadian Internet Policy and Public Interest Clinic. Picking which downloads to monitor is essentially “completely at the discretion of CSE,” Israel added. The file-sharing surveillance also raises questions about the number of Canadians whose downloading habits could have been swept up as part of LEVITATION’s dragnet. By law, CSE isn’t allowed to target Canadians. In the LEVITATION presentation, however, two Canadian IP addresses that trace back to a web server in Montreal appear on a list of suspicious downloads found across the world. The same list includes downloads that CSE monitored in closely allied countries, including the United Kingdom, United States, Spain, Brazil, Germany and Portugal. It is unclear from the document whether LEVITATION has ever prevented any terrorist attacks. The agency cites only two successes of the program in the 2012 presentation: the discovery of a hostage video through a previously unknown target, and an uploaded document that contained the hostage strategy of a terrorist organization. The hostage in the discovered video was ultimately killed, according to public reports.

LEVITATION does not rely on cooperation from any of the file-sharing companies. A separate secret CSE operation codenamed ATOMIC BANJO obtains the data directly from internet cables that it has tapped into, and the agency then sifts out the unique IP address of each computer that downloaded files from the targeted websites. The IP addresses are valuable pieces of information to CSE’s analysts, helping to identify people whose downloads have been flagged as suspicious. The analysts use the IP addresses as a kind of search term, entering them into other surveillance databases that they have access to, such as the vast repositories of intercepted Internet data shared with the Canadian agency by the NSA and its British counterpart Government Communications Headquarters. If successful, the searches will return a list of results showing other websites visited by the people downloading the files – in some cases revealing associations with Facebook or Google accounts. In turn, these accounts may reveal the names and the locations of individual downloaders, opening the door for further surveillance of their activities.

Canada’s leading surveillance agency is monitoring millions of Internet users’ file downloads in a dragnet search to identify extremists, according to top-secret documents. The covert operation, revealed Wednesday by CBC News in collaboration with The Intercept, taps into Internet cables and analyzes records of up to 15 million downloads daily from popular websites commonly used to share videos, photographs, music, and other files. The revelations about the spying initiative, codenamed LEVITATION, are the first from the trove of files provided by National Security Agency whistleblower Edward Snowden to show that the Canadian government has launched its own globe-spanning Internet mass surveillance system. According to the documents, the LEVITATION program can monitor downloads in several countries across Europe, the Middle East, North Africa, and North America. It is led by the Communications Security Establishment, or CSE, Canada’s equivalent of the NSA. (The Canadian agency was formerly known as “CSEC” until a recent name change.)