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trojan

Definitions:

  In the machine learning context, a malicious modification to a model that is difficult to detect, may appear harmless, but that can alter the intended function of the system upon a signal from an attacker to cause a malicious behavior desired by the attacker. For Trojan attacks to be effective, the trigger must be rare in the normal operating environment so that it does not affect the normal effectiveness of the AI and raise the suspicions of users. In the machine learning context, trojan may be used interchangeably with backdoor pattern.
Sources:
NIST AI 100-2e2025