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1. Measures and controls that ensure confidentiality, integrity, and availability of the information processed and stored by a computer. [NIS] Synonym automated information systems security. 2. The application of hardware, firmware and software security features to a computer system in order to protect against, or prevent, the unauthorized disclosure, manipulation, deletion of information or denial of service. (AC/35(WG/1)WP(88)4-7) [NATO]