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The SIGQUIT signal is sent to a process by its controlling terminal when the user requests that the process quit and perform a core dump. SIGSEGV The SIGSEGV signal is sent to a process when it makes an invalid virtual memory reference, or segmentation fault , i.e. when it performs a seg mentation v iolation.
Signals intelligence (SIGINT) is the act and field of intelligence-gathering by interception of signals, whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication (electronic intelligence—abbreviated to ELINT). [1]
Foreign instrumentation signals intelligence (FISINT) – entails the collection and analysis of telemetry data from a missile or sometimes from aircraft tests; formerly known as telemetry intelligence or TELINT
A SIGINT signal can be generated very simply by pressing CTRL+C in most Unix shells. It is also common for CTRL+Z to be mapped to SIGTSTP ("terminal stop"), and for CTRL+\ (backslash) to be mapped to SIGQUIT, which can force a program to do a core dump.
The National Security Archive commented, "In 1987, Deputy Director for Science and Technology Evan Hineman established ... a new Office for Special Projects, concerned not with satellites, but with emplaced sensors—sensors that could be placed in a fixed location to collect signals intelligence or measurement and signature intelligence ...
SIGINT Systems appears to be a British firm that makes the "HARVESTER family of SIGINT database applications (that) provide unique and cost-effective solutions to a wide range of collection requirements" [35] and has a website that can serve as a basic tutorial on the technical aspects of what SIGINT systems collect.
TK covers space-based IMINT (imagery intelligence), SIGINT (signals intelligence), and MASINT (measurement and signature intelligence) collection platforms; related processing and analysis techniques; and research, design, and operation of these platforms (but see Reserve below). [15]
It is distinct from more technical intelligence-gathering disciplines, such as signals intelligence (SIGINT), imagery intelligence (IMINT), and measurement and signature intelligence (MASINT). [1] HUMINT can be conducted in a variety of ways, including via espionage, reconnaissance, interrogation, witness interviews, or torture.