Host-based intrusion-detection is the art of detecting malicious activity within a single computer. A host-based intrusion detection system (HIDS) uses host log information, system activity, and scanners such as virus scanners[?] to determine whether a computer host is being used for illegitimate purposes. HIDS may be local to the protected host, remote (via syslogd, etc), or part of a distributed intrusion detection system[?].
... Service (MI5)
Special Operations Executive (SOE in World War Two)
United States
Air Intelligence Agency[?] (AIA)
Army Security Agency[?] (ASA)
Central ...