Vaults, Mirrors, and Masks: Rediscovering U. S. Counterintelligence. Хранилища, зеркала и маски: открываем заново контрразведку США. Дженнифер Э. Симс, Бертон Гербер (Jennifer E. Sims, Burton Gerber) ; Georgetown University Press

Decision makers matching wits with an adversary want intelligence-good, relevant information to help them win. Intelligence can gain these advantages through directed research and analysis, agile collection, and the timely use of guile and theft. Counterintelligence is the art and practice of defeating these endeavors. Its purpose is the same as that of positive intelligence-to gain advantage-but it does so by exploiting, disrupting, denying, or manipulating the intelligence activities of others. The tools of counterintelligence include security systems, deception, and disguise: vaults, mirrors, and masks.

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