CAS-004 Security Engineering Practice Question
A web server is configured to use TLS 1.3. Which of the following is a key security benefit of TLS 1.3 over earlier versions?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Forward secrecy for all key exchanges
TLS 1.3 provides forward secrecy by default, meaning session keys are not compromised even if the server's long-term private key is compromised. 0-RTT is a performance feature but can be vulnerable to replay. Removed cipher suites is a cleanup. Certificate pinning is not part of TLS 1.3.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Removal of weak cipher suites
Why it's wrong here
This is a security improvement but not the primary benefit.
- ✗
Support for 0-RTT handshake
Why it's wrong here
0-RTT improves performance but introduces replay risks; it is not a security benefit.
- ✗
Mandatory certificate pinning
Why it's wrong here
Certificate pinning is not required by TLS 1.3.
- ✓
Forward secrecy for all key exchanges
Why this is correct
TLS 1.3 mandates ephemeral Diffie-Hellman key exchanges, ensuring forward secrecy.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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