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  A recognizable, distinguishing pattern associated with an attack, such as a binary string in a virus or a particular set of keystrokes used to gain unauthorized access to a system.
NIST SP 800-12 Rev. 1 under Signature from NIST SP 800-61
NIST SP 800-61 Rev. 2 under Signature

  The ability to trace the origin of the data.
NIST SP 800-113 under Signature

  A set of characteristics of known malware instances that can be used to identify known malware and some new variants of known malware.
NIST SP 800-83 Rev. 1 under Signature

  A recognizable, distinguishing pattern. See attack signature and digital signature.
CNSSI 4009-2015 [Superseded] from NIST SP 800-61 Rev. 2 - Adapted