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CompTIA Security+ study material · question 488 of 611

A collision is found in the hash function underlying a signature scheme. What has been broken, even though no key was compromised?

  1. The forward secrecy of the session
  2. The integrity guarantee of the signature
  3. The availability of the signing service
  4. The confidentiality of signed messages
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Answer: B. The integrity guarantee of the signature

If two documents share a hash, a signature over one is equally a signature over the other.

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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