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Person, group, organization, or government that conducts or has the intent to conduct detrimental activities.
CNSSI 4009-2015 from NIST SP 800-30 Rev. 1
NIST SP 800-30 Rev. 1 under Adversary from DHS Risk Lexicon
An entity that is not authorized to access or modify information, or who works to defeat any protections afforded the information.
NIST SP 800-107 Rev. 1 under Adversary