Communications Security Establishment

XKeyscore (XKEYSCORE or XKS) is a classified computer system used by the United States National Security Agency (NSA) for searching and analyzing global Internet data, which it collects in real time. The NSA has shared XKeyscore with other intelligence agencies, including the Australian Signals Directorate, Canada's Communications Security Establishment, New Zealand's Government Communications Security Bureau, Britain's Government Communications Headquarters, Japan's Defense Intelligence Headquarters, Germany's Bundesnachrichtendienst, and the Danish Defense Intelligence Service, the latter of

national cryptologic agency of the Government of Canada