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CompTIA Security+ study material · question 546 of 611

An adversary records encrypted sessions today and obtains the server's long-term private key next year. Which property prevents them decrypting the recordings?

  1. Forward secrecy
  2. Certificate pinning
  3. Key escrow
  4. Key stretching
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Answer: A. Forward secrecy

Each session used ephemeral keys that were discarded, so the long-term key does not unlock past traffic.

Source: RFC 8446 (IETF) — RFC 8446 § 1.2 Major Differences from TLS 1.2

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