Denial of Service

An attack that prevents or impairs the authorized use of information system resources or services.

Adapted from: NCSD Glossary.

Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies ( as of 11 November 2015, Global Standards


Denial of Service

Prevention or interruption of authorized access to a system resource or the delaying of system operations and functions [11].

  • NOTE: In the context of industrial automation and control systems, denial of service can refer to loss of process function, not just loss of data communications.

Source: ANSI/ISA–99.00.01–2007, Security for Industrial Automation and Control Systems, Part 1: Terminology, Concepts, and Models, 29 October 2007. National Standard

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