Sean Gallagher erklärt auf Ars Technica die Entwicklung von XKeyscore, seit den Ursprüngen von Carnivore und Narus:
XKeyscore takes the data brought in by the packet capture systems connected to the NSA’s taps and processes it with arrays of Linux machines. The Linux processing nodes can run a collection of „plugin“ analysis engines that look for content in captured network sessions; there are specialized plugins for mining packets for phone numbers, e‑mail addresses, webmail and chat activity, and the full content of users’ Web browser sessions. For selected traffic, XKeyscore can also generate a full replay of a network session between two Internet addresses.
Weitere Details gibt’s in den gelekaten Folien.