Signal Intelligence (SIGINT) refers to intelligence that is gathered by intercepting and analyzing electronic signals, such as radio and radar transmissions, and other forms of electromagnetic radiation. SIGINT is a critical tool for modern intelligence gathering and is used by intelligence agencies around the world to support national security objectives.
SIGINT collection can be passive, where the intelligence agency intercepts and analyzes signals without actively interfering with them, or active, where the agency actively seeks to disrupt or manipulate signals for intelligence purposes. Passive SIGINT collection is often conducted through a network of listening posts, satellites, and other electronic surveillance systems. Active SIGINT collection can involve jamming or intercepting communications to gain access to sensitive information.
SIGINT can be used to gather a range of intelligence, including information on military activities, terrorist communications, criminal activities, and diplomatic negotiations. It can also provide insights into the capabilities and intentions of foreign governments and organizations, as well as their technical and scientific developments.
However, SIGINT collection is often controversial, as it can involve the interception of private communications and the violation of privacy and civil liberties. Many countries have laws and regulations in place to govern the use of SIGINT, and the collection and analysis of SIGINT is subject to strict oversight and accountability measures.