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 since 2008 and became operational in the autumn of 2011.

Tempora uses intercepts on the fibre-optic cables that make up 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 overseas, 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 program to former Guardian journalist Glenn Greenwald in May 2013, as part of his revelations of government-sponsored mass surveillance programs. Documents Snowden acquired claimed that data collected by the Tempora program 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 however 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 UK has a huge dog in this fight...They [GCHQ] are worse than the U.S."

...
Wikipedia