Signals Intelligence (SIGINT or SI) is a NSA/CSS intelligence-gathering operation through wires(cables) and wireless(radio waves). It is presumably headquartered in Information Operations Technology Center (IOTC), Fort Meade, Maryland, with branches around the US, including San Antonio, Texas.
NSA PRISM is a project of this 'INT'.
There are 3 divisions(INT) in SIGINT
- COMINT: Communications Intelligence
- ELINT: Electronic Intelligence
- TELINT/FISINT: Telemetry Intelligence / Foreign Instrumentation Signals Intelligence
ComInt has partnerships with over 80 Global Corporations including Microsoft, Intel, IBM, Verizon, AT&T, Oracle, Qualcomm, EDS, HP, Cisco, Motorola, Qwest.
ComInt also has access to Internet backbone (bandwidth pipelines) within USA, and routers and switches made by US companies.
UEFI is suspected to be the born out of the partnership between Microsoft, Intel, Apple & NSA.