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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 said would 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.”

A document from the GCHQ target analysis center (GTAC) shows the Black Hole repository’s structure.

The data is searched by GCHQ analysts in a hunt for behavior online that could be connected to terrorism or other criminal activity. But it has also served a broader and more controversial purpose — helping the agency hack into European companies’ computer networks. In the lead up to its secret mission targeting Netherlands-based Gemalto, the largest SIM card manufacturer in the world, GCHQ used MUTANT BROTH in an effort to identify the company’s employees so it could hack into their computers. The system helped the agency analyze intercepted Facebook cookies it believed were associated with Gemalto staff located at offices in France and Poland. GCHQ later successfully infiltrated Gemalto’s internal networks, stealing encryption keys produced by the company that protect the privacy of cell phone communications.

Similarly, MUTANT BROTH proved integral to GCHQ’s hack of Belgian telecommunications provider Belgacom. The agency entered IP addresses associated with Belgacom into MUTANT BROTH to uncover information about the company’s employees. Cookies associated with the IPs revealed the Google, Yahoo, and LinkedIn accounts of three Belgacom engineers, whose computers were then targeted by the agency and infected with malware. The hacking operation resulted in GCHQ gaining deep access into the most sensitive parts of Belgacom’s internal systems, granting British spies the ability to intercept communications passing through the company’s networks.

In March, a U.K. parliamentary committee published the findings of an 18-month review of GCHQ’s operations and called for an overhaul of the laws that regulate the spying. The committee raised concerns about the agency gathering what it described as “bulk personal datasets” being held about “a wide range of people.” However, it censored the section of the report describing what these “datasets” contained, despite acknowledging that they “may be highly intrusive.” The Snowden documents shine light on some of the core GCHQ bulk data-gathering programs that the committee was likely referring to — pulling back the veil of secrecy that has shielded some of the agency’s most controversial surveillance operations from public scrutiny. KARMA POLICE and MUTANT BROTH are among the key bulk collection systems. But they do not operate in isolation — and the scope of GCHQ’s spying extends far beyond them.

The agency operates a bewildering array of other eavesdropping systems, each serving its own specific purpose and designated a unique code name, such as: SOCIAL ANTHROPOID, which is used to analyze metadata on emails, instant messenger chats, social media connections and conversations, plus “telephony” metadata about phone calls, cell phone locations, text and multimedia messages; MEMORY HOLE, which logs queries entered into search engines and associates each search with an IP address; MARBLED GECKO, which sifts through details about searches people have entered into Google Maps and Google Earth; and INFINITE MONKEYS, which analyzes data about the usage of online bulletin boards and forums. GCHQ has other programs that it uses to analyze the content of intercepted communications, such as the full written body of emails and the audio of phone calls. One of the most important content collection capabilities is TEMPORA, which mines vast amounts of emails, instant messages, voice calls and other communications and makes them accessible through a Google-style search tool named XKEYSCORE.

As of September 2012, TEMPORA was collecting “more than 40 billion pieces of content a day” and it was being used to spy on people across Europe, the Middle East, and North Africa, according to a top-secret memo outlining the scope of the program. The existence of TEMPORA was first revealed by The Guardian in June 2013. To analyze all of the communications it intercepts and to build a profile of the individuals it is monitoring, GCHQ uses a variety of different tools that can pull together all of the relevant information and make it accessible through a single interface. SAMUEL PEPYS is one such tool, built by the British spies to analyze both the content and metadata of emails, browsing sessions, and instant messages as they are being intercepted in real time. One screenshot of SAMUEL PEPYS in action shows the agency using it to monitor an individual in Sweden who visited a page about GCHQ on the U.S.-based anti-secrecy website Cryptome.

Partly due to the U.K.’s geographic location — situated between the United States and the western edge of continental Europe — a large amount of the world’s Internet traffic passes through its territory across international data cables. In 2010, GCHQ noted that what amounted to “25 percent of all Internet traffic” was transiting the U.K. through some 1,600 different cables. The agency said that it could “survey the majority of the 1,600” and “select the most valuable to switch into our processing systems.”

According to Joss Wright, a research fellow at the University of Oxford’s Internet Institute, tapping into the cables allows GCHQ to monitor a large portion of foreign communications. But the cables also transport masses of wholly domestic British emails and online chats, because when anyone in the U.K. sends an email or visits a website, their computer will routinely send and receive data from servers that are located overseas. “I could send a message from my computer here [in England] to my wife’s computer in the next room and on its way it could go through the U.S., France, and other countries,” Wright says. “That’s just the way the Internet is designed.” In other words, Wright adds, that means “a lot” of British data and communications transit across international cables daily, and are liable to be swept into GCHQ’s databases.

A map from a classified GCHQ presentation about intercepting communications from undersea cables. GCHQ is authorized to conduct dragnet surveillance of the international data cables through so-called external warrants that are signed off by a government minister. The external warrants permit the agency to monitor communications in foreign countries as well as British citizens’ international calls and emails — for example, a call from Islamabad to London. They prohibit GCHQ from reading or listening to the content of “internal” U.K. to U.K. emails and phone calls, which are supposed to be filtered out from GCHQ’s systems if they are inadvertently intercepted unless additional authorization is granted to scrutinize them. However, the same rules do not apply to metadata. A little-known loophole in the law allows GCHQ to use external warrants to collect and analyze bulk metadata about the emails, phone calls, and Internet browsing activities of British people, citizens of closely allied countries, and others, regardless of whether the data is derived from domestic U.K. to U.K. communications and browsing sessions or otherwise. In March, the existence of this loophole was quietly acknowledged by the U.K. parliamentary committee’s surveillance review, which stated in a section of its report that “special protection and additional safeguards” did not apply to metadata swept up using external warrants and that domestic British metadata could therefore be lawfully “returned as a result of searches” conducted by GCHQ.

Perhaps unsurprisingly, GCHQ appears to have readily exploited this obscure legal technicality. Secret policy guidance papers issued to the agency’s analysts instruct them that they can sift through huge troves of indiscriminately collected metadata records to spy on anyone regardless of their nationality. The guidance makes clear that there is no exemption or extra privacy protection for British people or citizens from countries that are members of the Five Eyes, a surveillance alliance that the U.K. is part of alongside the U.S., Canada, Australia, and New Zealand. “If you are searching a purely Events only database such as MUTANT BROTH, the issue of location does not occur,” states one internal GCHQ policy document, which is marked with a “last modified” date of July 2012. The document adds that analysts are free to search the databases for British metadata “without further authorization” by inputing a U.K. “selector,” meaning a unique identifier such as a person’s email or IP address, username, or phone number. Authorization is “not needed for individuals in the U.K.,” another GCHQ document explains, because metadata has been judged “less intrusive than communications content.” All the spies are required to do to mine the metadata troves is write a short “justification” or “reason” for each search they conduct and then click a button on their computer screen.

Intelligence GCHQ collects on British persons of interest is shared with domestic security agency MI5, which usually takes the lead on spying operations within the U.K. MI5 conducts its own extensive domestic surveillance as part of a program called DIGINT (digital intelligence).

GCHQ’s documents suggest that it typically retains metadata for periods of between 30 days to six months. It stores the content of communications for a shorter period of time, varying between three to 30 days. The retention periods can be extended if deemed necessary for “cyber defense.” One secret policy paper dated from January 2010 lists the wide range of information the agency classes as metadata — including location data that could be used to track your movements, your email, instant messenger, and social networking “buddy lists,” logs showing who you have communicated with by phone or email, the passwords you use to access “communications services” (such as an email account), and information about websites you have viewed.

Records showing the full website addresses you have visited — for instance, www.gchq.gov.uk/what_we_do — are treated as content. But the first part of an address you have visited — for instance, www.gchq.gov.uk — is treated as metadata. In isolation, a single metadata record of a phone call, email, or website visit may not reveal much about a person’s private life, according to Ethan Zuckerman, director of Massachusetts Institute of Technology’s Center for Civic Media. But if accumulated and analyzed over a period of weeks or months, these details would be “extremely personal,” he told The Intercept, because they could reveal a person’s movements, habits, religious beliefs, political views, relationships, and even sexual preferences. For Zuckerman, who has studied the social and political ramifications of surveillance, the most concerning aspect of large-scale government data collection is that it can be “corrosive towards democracy” — leading to a chilling effect on freedom of expression and communication. “Once we know there’s a reasonable chance that we are being watched in one fashion or another it’s hard for that not to have a ‘panopticon effect,’” he said, “where we think and behave differently based on the assumption that people may be watching and paying attention to what we are doing.”

When compared to surveillance rules in place in the U.S., GCHQ notes in one document that the U.K. has “a light oversight regime.” The more lax British spying regulations are reflected in secret internal rules that highlight greater restrictions on how NSA databases can be accessed. The NSA’s troves can be searched for data on British citizens, one document states, but they cannot be mined for information about Americans or other citizens from countries in the Five Eyes alliance. No such constraints are placed on GCHQ’s own databases, which can be sifted for records on the phone calls, emails, and Internet usage of Brits, Americans, and citizens from any other country. The scope of GCHQ’s surveillance powers explain in part why Snowden told The Guardian in June 2013 that U.K. surveillance is “worse than the U.S.” In an interview with Der Spiegel in July 2013, Snowden added that British Internet cables were “radioactive” and joked: “Even the Queen’s selfies to the pool boy get logged.”

In recent years, the biggest barrier to GCHQ’s mass collection of data does not appear to have come in the form of legal or policy restrictions. Rather, it is the increased use of encryption technology that protects the privacy of communications that has posed the biggest potential hindrance to the agency’s activities. “The spread of encryption … threatens our ability to do effective target discovery/development,” says a top-secret report co-authored by an official from the British agency and an NSA employee in 2011. “Pertinent metadata events will be locked within the encrypted channels and difficult, if not impossible, to prise out,” the report says, adding that the agencies were working on a plan that would “(hopefully) allow our Internet Exploitation strategy to prevail.”

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.

n recent days, the United States circulated to its allies a confidential paper highlighting American objectives in the negotiations, "Right to Privacy in the Digital Age -- U.S. Redlines." It calls for changing the Brazilian and German text so "that references to privacy rights are referring explicitly to States' obligations under ICCPR and remove suggestion that such obligations apply extraterritorially." In other words: America wants to make sure it preserves the right to spy overseas. The U.S. paper also calls on governments to promote amendments that would weaken Brazil's and Germany's contention that some "highly intrusive" acts of online espionage may constitute a violation of freedom of expression. Instead, the United States wants to limit the focus to illegal surveillance -- which the American government claims it never, ever does. Collecting information on tens of millions of people around the world is perfectly acceptable, the Obama administration has repeatedly said. It's authorized by U.S. statute, overseen by Congress, and approved by American courts.

"Recall that the USG's [U.S. government's] collection activities that have been disclosed are lawful collections done in a manner protective of privacy rights," the paper states. "So a paragraph expressing concern about illegal surveillance is one with which we would agree." The privacy resolution, like most General Assembly decisions, is neither legally binding nor enforceable by any international court. But international lawyers say it is important because it creates the basis for an international consensus -- referred to as "soft law" -- that over time will make it harder and harder for the United States to argue that its mass collection of foreigners' data is lawful and in conformity with human rights norms. "They want to be able to say ‘we haven't broken the law, we're not breaking the law, and we won't break the law,'" said Dinah PoKempner, the general counsel for Human Rights Watch, who has been tracking the negotiations. The United States, she added, wants to be able to maintain that "we have the freedom to scoop up anything we want through the massive surveillance of foreigners because we have no legal obligations."

The United States negotiators have been pressing their case behind the scenes, raising concerns that the assertion of extraterritorial human rights could constrain America's effort to go after international terrorists. But Washington has remained relatively muted about their concerns in the U.N. negotiating sessions. According to one diplomat, "the United States has been very much in the backseat," leaving it to its allies, Australia, Britain, and Canada, to take the lead. There is no extraterritorial obligation on states "to comply with human rights," explained one diplomat who supports the U.S. position. "The obligation is on states to uphold the human rights of citizens within their territory and areas of their jurisdictions."

The position, according to Jamil Dakwar, the director of the American Civil Liberties Union's Human Rights Program, has little international backing. The International Court of Justice, the U.N. Human Rights Committee, and the European Court have all asserted that states do have an obligation to comply with human rights laws beyond their own borders, he noted. "Governments do have obligation beyond their territories," said Dakwar, particularly in situations, like the Guantanamo Bay detention center, where the United States exercises "effective control" over the lives of the detainees. Both PoKempner and Dakwar suggested that courts may also judge that the U.S. dominance of the Internet places special legal obligations on it to ensure the protection of users' human rights.

"It's clear that when the United States is conducting surveillance, these decisions and operations start in the United States, the servers are at NSA headquarters, and the capabilities are mainly in the United States," he said. "To argue that they have no human rights obligations overseas is dangerous because it sends a message that there is void in terms of human rights protection outside countries territory. It's going back to the idea that you can create a legal black hole where there is no applicable law." There were signs emerging on Wednesday that America may have been making ground in pressing the Brazilians and Germans to back on one of its toughest provisions. In an effort to address the concerns of the U.S. and its allies, Brazil and Germany agreed to soften the language suggesting that mass surveillance may constitute a violation of human rights. Instead, it simply deep "concern at the negative impact" that extraterritorial surveillance "may have on the exercise of and enjoyment of human rights." The U.S., however, has not yet indicated it would support the revised proposal.

The concession "is regrettable. But it’s not the end of the battle by any means," said Human Rights Watch’s PoKempner. She added that there will soon be another opportunity to corral America's spies: a U.N. discussion on possible human rights violations as a result of extraterritorial surveillance will soon be taken up by the U.N. High commissioner.