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XKeyscore (XKEYSCORE or XKS) is a secret computer system used by the United States National Security Agency (NSA) for searching and analyzing global Internet data, which it collects in real time.
XKEYSCORE is a piece of Linux software that is typically deployed on Red Hat servers. It uses the Apache web server and stores collected data in MySQL databases.
The slides explain how XKeyscore can track encrypted virtual private networks (VPN) sessions and their participants, can capture metadata on who's using PGP (pretty good privacy) in email or who is encrypting their Word documents, which later can be decrypted.
In the NSA PowerPoint presentation posted by the Guardian, Xkeyscore is made to look like a veritable Google for intercepted data, easily sorting and parse vast amounts of information in...
XKeyscore takes the data brought in by the packet capture systems connected to the NSA's taps (Update: This technology is code-named TURMOIL) and processes it with arrays of Linux machines. The...
When a group of people overload a server or network with a flood of network traffic (causing a "distributed denial-of-service" or DDoS attack), users can be identified using XKeyscore.
The NSA’s XKEYSCORE program, first revealed by The Guardian, sweeps up countless people’s Internet searches, emails, documents, usernames and passwords, and other private communications.
XKeyscore, a program disclosed by Edward Snowden, uses autonomous collection of massive data sets that potentially capture Americans’ communications.
The Privacy and Civil Liberties Oversight Board spent more than six years scrutinizing the surveillance-related system, called XKeyscore. Its report is classified.
The XKeyscore presentation shows how empty those words are. The N.S.A., it appears, doesn’t just turn to its metadata library to see who’s been calling a terrorist; it uses it in a coördinated...