Person, group, organization, or government that conducts or has the intent to conduct detrimental activities.
Sources:
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.
Sources:
NIST SP 800-107 Rev. 1
under Adversary
A malicious entity whose goal is to determine, to guess, or to influence the output of an RBG.
Sources:
NIST IR 8427