Message authentication code

nouncandidate·updated May 9, 2026

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A cryptographic checksum on data that uses a symmetric key to detect both accidental and intentional modifications of the data. MACs provide authenticity and integrity protection, but not non-repudiation protection.

polysemousMWE

Classifications

per-axis with provenance

Entity Type

Control85%llm-generatedllm:claude-haiku-4-5

?unassignedlast reviewed —

Sensitivity

unclassified

Information Class

unclassified

Variants

4 surface forms

acronym: MAC
plural: Message authentication codes
possessive: Message authentication code's
pluralpossessive: Message authentication codes'

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