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SIGINT The SIGINT signal is sent to a process by its controlling terminal when a user wishes to interrupt the process. This is typically initiated by pressing Ctrl+C, but on some systems, the "delete" character or "break" key can be used. [13] SIGKILL The SIGKILL signal is sent to a process to cause it to terminate immediately (kill). In ...
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]
In computer science, interprocess communication (IPC) is the sharing of data between running processes in a computer system. Mechanisms for IPC may be provided by an operating system . Applications which use IPC are often categorized as clients and servers , where the client requests data and the server responds to client requests. [ 1 ]
Since it deals with signals that have communicational content, it is a subset of Communications Intelligence (COMINT), which, in turn, is a subset of SIGINT. Unlike general COMINT signals, the content of FISINT signals is not in regular human language, but rather in machine to machine (instrumentation) language or in a combination of regular ...
Signal collectors, which concentrate the energy, as with a telescope lens, or a radar antenna that focuses the energy at a detector; Signal detectors, such as charge-coupled devices for light or a radar receiver; Signal processing, which may remove artifacts from single images, or compute a synthetic image from multiple views; Recording mechanism
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.
Shannon–Weaver model of communication [86] The Shannon–Weaver model is another early and influential model of communication. [10] [32] [87] It is a linear transmission model that was published in 1948 and describes communication as the interaction of five basic components: a source, a transmitter, a channel, a receiver, and a destination.
Before the development of radar and other electronics techniques, signals intelligence (SIGINT) and communications intelligence (COMINT) were essentially synonymous. Sir Francis Walsingham ran a postal interception bureau with some cryptanalytic capability during the reign of Elizabeth I, but the technology was only slightly less advanced than men with shotguns, during World War I, who jammed ...