The paper presents the approach to the description
of the broad domain of national security as a thesaurus for
automatic document processing. The created Security thesaurus
has the representation model of the RuThes thesaurus.The
Security thesaurus includes terminology related to social, national
and religious conflicts, extremism and terrorism, information
security. It is used in a specialized information-analytical system
and for automatic text categorization according to several cat-
egorization schemes. The information-retrieval system provides
several search instruments including word, phrase and concept
search, category and facet search. It also supports the creation
of analytical reports
