Tempora

Tempora is the codeword for a formerly-secret computer system that is used by the British Government Communications Headquarters (GCHQ). This system is used to buffer most Internet communications that are extracted from fibre-optic cables, so these can be processed and searched at a later time. It was tested from 2008 and became operational in late 2011.

Tempora uses intercepts on the fibre-optic cables that serve as the backbone of the Internet to gain access to large amounts of Internet users' personal data, without any individual suspicion or targeting. The intercepts are placed in the United Kingdom and on the UK military base at Ayios Nikolaos in the British Overseas Territory of Akrotiri and Dhekelia. The intercepts are placed with the knowledge of companies owning either the cables or landing stations.

The existence of Tempora was revealed by Edward Snowden, a former American intelligence contractor who leaked information about the programme to former Guardian journalist Glenn Greenwald in May 2013 as part of his revelations of government-sponsored mass surveillance programmes. Documents Snowden acquired showed that data collected by the Tempora programme is shared with the National Security Agency of the United States.

According to Edward Snowden, Tempora has two principal components called "Mastering the Internet" (MTI) and "Global Telecoms Exploitation" (GTE). He claimed that each is intended to collate online and telephone traffic. This contradicts two original documents, which say that Tempora is only for Internet traffic, just like the XKeyscore system of the NSA, components of which are incorporated in Tempora.

It is alleged that GCHQ produces larger amounts of metadata than NSA. By May 2012, 300 GCHQ analysts and 250 NSA analysts had been assigned to sort data.

The Guardian claims that no distinction is made in the gathering of data between public citizens and targeted suspects. Tempora is said to include recordings of telephone calls, the content of email messages, Facebook entries and the personal Internet history of users. Snowden said of Tempora that "It's not just a U.S. problem. The U.K. has a huge dog in this fight...They [GCHQ] are worse than the U.S."

Claims exist that Tempora was possible only by way of secret agreements with commercial companies, described in Snowden's leaked documents as "intercept partners". Some companies are alleged to have been paid for their co-operation. Snowden also alleged that GCHQ staff were urged to disguise the origin of material in their reports for fear that the role of the companies as intercept partners would cause "high-level political fallout". The companies are forbidden to reveal the existence of warrants compelling them to allow GCHQ access to the cables. If the companies fail to comply they can be compelled to do so.

Lawyers for GCHQ said it would be impossible to list the total number of people targeted by Tempora because "this would be an infinite list which we couldn't manage".