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CompTIA Security+ study material · question 548 of 611

What problem does a public key infrastructure solve?

  1. It makes asymmetric encryption faster
  2. It removes the need for symmetric encryption
  3. It lets strangers trust each other's public keys by binding identities to them through an authority
  4. It generates keys on behalf of users
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Answer: C. It lets strangers trust each other's public keys by binding identities to them through an authority

Without that binding, a public key is just a number with no verified claim about whose it is.

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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