Exclusive: British spy agency collects and stores vast quantities of global email messages, Facebook posts, internet histories and calls, and shares them with NSA, latest documents from Edward Snowden reveal
Britain’s spy agency GCHQ has secretly gained access to the network of cables which carry the world’s phone calls and internet traffic and has started to process vast streams of sensitive personal information which it is sharing with its American partner, the National Security Agency (NSA).
The sheer scale of the agency’s ambition is reflected in the titles of its two principal components: Mastering the Internet and Global Telecoms Exploitation, aimed at scooping up as much online and telephone traffic as possible. This is all being carried out without any form of public acknowledgement or debate.
One key innovation has been GCHQ’s ability to tap into and store huge volumes of data drawn from fibre-optic cables for up to 30 days so that it can be sifted and analysed. That operation, codenamed Tempora, has been running for some 18 months.
GCHQ and the NSA are consequently able to access and process vast quantities of communications between entirely innocent people, as well as targeted suspects.
This includes recordings of phone calls, the content of email messages, entries on Facebook and the history of any internet user’s access to websites – all of which is deemed legal, even though the warrant system was supposed to limit interception to a specified range of targets.
The existence of the programme has been disclosed in documents shown to the Guardian by the NSA whistleblower Edward Snowden as part of his attempt to expose what he has called “the largest programme of suspicionless surveillance in human history”.
“It’s not just a US problem. The UK has a huge dog in this fight,” Snowden told the Guardian. “They [GCHQ] are worse than the US.”
However, on Friday a source with knowledge of intelligence argued that the data was collected legally under a system of safeguards, and had provided material that had led to significant breakthroughs in detecting and preventing serious crime.
Britain’s technical capacity to tap into the cables that carry the world’s communications – referred to in the documents as special source exploitation – has made GCHQ an intelligence superpower.
By 2010, two years after the project was first trialled, it was able to boast it had the “biggest internet access” of any member of the Five Eyes electronic eavesdropping alliance, comprising the US, UK, Canada, Australia and New Zealand.
UK officials could also claim GCHQ “produces larger amounts of metadata than NSA”. (Metadata describes basic information on who has been contacting whom, without detailing the content.)
By May last year 300 analysts from GCHQ, and 250 from the NSA, had been assigned to sift through the flood of data.
The Americans were given guidelines for its use, but were told in legal briefings by GCHQ lawyers: “We have a light oversight regime compared with the US”.
When it came to judging the necessity and proportionality of what they were allowed to look for, would-be American users were told it was “your call”.
The Guardian understands that a total of 850,000 NSA employees and US private contractors with top secret clearance had access to GCHQ databases.
The documents reveal that by last year GCHQ was handling 600m “telephone events” each day, had tapped more than 200 fibre-optic cables and was able to process data from at least 46 of them at a time.