CAS-004 Security Engineering Practice Question
A company wants to ensure that a compromised root CA does not affect the validity of previously issued certificates. Which PKI control should be implemented?
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
✓
Offline root CA and online issuing CA
CRLs and OCSP allow revocation, but offline root CA and issuing CA separation ensure that compromise of root does not directly affect issued certs if root is kept offline.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Certificate pinning
Why it's wrong here
Pinning does not prevent root compromise effects.
- ✓
Offline root CA and online issuing CA
Why this is correct
Keeping root CA offline prevents compromise of root from being used to issue new certs.
- ✗
Certificate transparency logs
Why it's wrong here
CT logs provide visibility, not protection against root compromise.
- ✗
Short-lived certificates
Why it's wrong here
Short-lived certs reduce window of misuse, but do not protect existing certs if root is compromised.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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