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Compartments of information are identified by code words. This is one means by which the "need to know" principle is formally and automatically enforced. [citation needed] In order to have access to material in a particular SCI "compartment", the person must first have the clearance level for the material.
Top Secret is the highest level of classification. However some information is further categorized/marked by adding a code word so that only those who have been cleared for each code word can see it. A document marked SECRET (CODE WORD) could be viewed only by a person with a secret or top secret clearance and that specific code word clearance.
It is possible that the term itself, supposedly suggested by Winston Churchill, was a "backronym"—a phrase created to fit an acronym such as the existing "To Gibraltar" code. The list of personnel cleared to know details of Overlord was known as the BIGOT list, and the people on it were known as "Bigots".
the identity of confidential source of information, intelligence or assistance to the Government of Canada. tools used for information gathering or intelligence. the object of a covert investigation, or a covert collection of information or intelligence. the identity of any person who is under covert surveillance.
A list of several such code words can be seen at Byeman Control System. Exercise terms – a combination of two words, normally unclassified, used exclusively to designate an exercise or test [1] In 1975, the Joint Chiefs of Staff introduced the Code Word, Nickname, and Exercise Term System (NICKA) which automated the assignment of names.
Administrative (all arms) Access control. Cantonment: a temporary or semi-permanent military quarters; in South Asia, the term cantonment also describes permanent military stations. Chief of defence. Cloak and Dagger. Combat information center. Command (military formation) Command center. Command and control.
Hence, varying levels of clearance within organizations exist. Yet, even if someone has the highest clearance, certain "compartmentalized" information, identified by codewords referring to particular types of secret information, may still be restricted to certain operators, even with a lower overall security clearance.
Magic was set up to combine the US government's cryptologic capabilities in one organization dubbed the Research Bureau. Intelligence officers from the Army and Navy (and later civilian experts and technicians) were all under one roof. Although they worked on a series of codes and cyphers, their most important successes involved RED, BLUE, and ...