POKERFACE – (GCHQ)

POKERFACE – (GCHQ) Internet surveillance system relying on the removal of low-value traffic (LVT) to enable high-speed filtering and selection of high-value traffic (HVT). Using Massive Volume Reduction (MVR) to cut down on data bulk, the system searches for trigger words or 'selectors' - search terms, e-mail accounts, phone numbers, IP addresses etc. 40,000 of these 'selectors' were chosen by GCHQ, 1ith a further 31,000 by the NSA. Most of the information extracted is described as "content", such as recordings of phone calls or the substance of email messages. The rest is metadata.