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CompTIA Security+ study material · question 547 of 611

Which two properties does a digital signature provide that an HMAC does not? Choose two.

  1. Non-repudiation
  2. Authenticity of the sender to a party sharing the key
  3. Integrity of the message
  4. Proof that only the private key holder could have produced it
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Answer: A. Non-repudiation
D. Proof that only the private key holder could have produced it

An HMAC gives integrity and authenticity, but either holder of the shared key could have produced it.

Source: NIST SP 800-57 Part 1 Rev. 5 (NIST) — SP 800-57 Part 1 Rev. 5 § 5 General Key Management Guidance

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