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    Glossary
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CI

Abbreviations / Acronyms / Synonyms:

Confidence interval
Ciphertext Integrity
Configuration Item
Critical Infrastructure

Definitions:

  An aggregation of information system components that is designated for configuration management and treated as a single entity in the configuration management process.
Sources:
NIST SP 800-128 under Configuration Item

  An interval estimate [low, high] of a population parameter. If the population is repeatedly sampled, and confidence intervals are computed for each sample with significance level α, approximately 100(1− α) % of the intervals are expected to contain the true population parameter.
Sources:
NIST SP 800-90B under Confidence interval

  System and assets, whether physical or virtual, so vital to the United States that the incapacity or destruction of such systems and assets would have a debilitating impact on security, national economic security, national public health or safety, or any combination of those matters.
Sources:
NIST SP 800-30 Rev. 1 under Critical Infrastructure

  Essential services and related assets that underpin American society and serve as the backbone of the nation's economy, security, and health.
Sources:
NISTIR 8183 under Critical Infrastructure from DHS - Unknown Source, National Cybersecurity & Communications Integration Center
NISTIR 8183 Rev. 1 under Critical Infrastructure from DHS
NISTIR 8183A Vol. 1 under Critical Infrastructure from DHS
NISTIR 8183A Vol. 2 under Critical Infrastructure from DHS
NISTIR 8183A Vol. 3 under Critical Infrastructure from DHS

  An item or aggregation of hardware or software or both that is designed to be managed as a single entity. Configuration items may vary widely in complexity, size and type, ranging from an entire system including all hardware, software and documentation, to a single module, a minor hardware component or a single software package.
Sources:
NISTIR 7695 under Configuration Item from ISO/IEC 19770-2 - Adapted

  Systems and assets, whether physical or virtual, so vital to the United States that the incapacity or destruction of such systems and assets would have a debilitating impact on cybersecurity, national economic security, national public health or safety, or any combination of those matters.
Sources:
NIST Cybersecurity Framework Version 1.1 under Critical Infrastructure