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A message authentication code is described as a cryptographic:

AChipset
BChecksum
CChainsaw
DChartset
Answer & Solution
Correct answer: B. Checksum
1. A MAC is computed over data to protect it. 2. It behaves like an error-detecting value with a key. 3. A Message Authentication Code is a cryptographic checksum on data. 4. It uses an approved security function and a symmetric key. _Source: NIST SP 800-175B Rev. 1, 'Guideline for Using Cryptographic Standards in the Federal Government'_
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