- A
Generate a new root CA, sign new subordinate CAs, distribute the new root via Group Policy, and re-issue all end-entity certificates.
This ensures all systems trust the new CA hierarchy and have valid certificates.
- B
Publish a certificate revocation list (CRL) and wait for existing certificates to expire.
Why wrong: This leaves the system insecure until expiration, which could be years.
- C
Generate a new root CA certificate and key, then re-issue all subordinate CA certificates without re-issuing end-entity certificates.
Why wrong: End-entity certificates remain untrusted without re-issuance.
- D
Enable OCSP stapling on all web servers to check revocation status in real time.
Why wrong: OCSP does not replace the compromised root; trust in the root must be re-established.
Quick Answer
The correct approach is to generate a new root CA, sign new subordinate CAs, distribute the new root via Group Policy, and re-issue all end-entity certificates. This is necessary because a compromised root CA private key invalidates the entire chain of trust; no amount of patching or revocation can salvage a hierarchy where the top-level key is exposed. On the SSCP exam, this scenario tests your understanding of PKI recovery and the principle that a root compromise forces a complete rebuild from scratch. A common trap is assuming you can simply re-sign existing subordinate CAs or reuse the old root—but once the private key is stolen, every certificate signed by that root is untrustworthy. The memory tip is "Root rot, rebuild the lot"—if the root is compromised, you must start over and push the new trust anchor via Group Policy to minimize disruption.
SSCP Cryptography Practice Question
This SSCP practice question tests your understanding of cryptography. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A financial services firm with 500 servers and 2000 workstations uses an internal public key infrastructure (PKI) for authentication and secure communication. The root CA certificate is self-signed and stored on an offline root CA server. Recently, the root CA server was physically stolen from a locked data center. Although the server was encrypted, forensic analysis confirms that the root CA private key was extracted. The security team must immediately revoke trust in the compromised root CA and issue new certificates to all devices. The environment includes Active Directory and Group Policy. Which approach best ensures all systems trust the new CA hierarchy and obtain valid certificates with minimal disruption?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
Generate a new root CA, sign new subordinate CAs, distribute the new root via Group Policy, and re-issue all end-entity certificates.
Option A is correct because the root CA private key has been compromised, requiring the entire PKI hierarchy to be rebuilt from scratch. A new self-signed root CA must be generated, new subordinate CAs signed under it, and all end-entity certificates re-issued to devices. Distributing the new root CA certificate via Active Directory Group Policy ensures that all domain-joined systems trust the new hierarchy automatically, minimizing manual intervention and disruption.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Generate a new root CA, sign new subordinate CAs, distribute the new root via Group Policy, and re-issue all end-entity certificates.
Why this is correct
This ensures all systems trust the new CA hierarchy and have valid certificates.
Clue confirmation
The clue words "best", "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Publish a certificate revocation list (CRL) and wait for existing certificates to expire.
Why it's wrong here
This leaves the system insecure until expiration, which could be years.
- ✗
Generate a new root CA certificate and key, then re-issue all subordinate CA certificates without re-issuing end-entity certificates.
Why it's wrong here
End-entity certificates remain untrusted without re-issuance.
- ✗
Enable OCSP stapling on all web servers to check revocation status in real time.
Why it's wrong here
OCSP does not replace the compromised root; trust in the root must be re-established.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think re-issuing only subordinate CAs (Option C) is sufficient, overlooking that end-entity certificates signed by the compromised root remain untrusted and must also be replaced to restore a valid chain of trust.
Detailed technical explanation
How to think about this question
In a PKI, the root CA certificate is the trust anchor; if its private key is compromised, all certificates in the hierarchy are untrusted because the chain of trust is broken. Group Policy can deploy the new root CA certificate to the Trusted Root Certification Authorities store on all domain-joined Windows machines via the 'Certificates' snap-in or through a GPO setting. Re-issuing end-entity certificates typically involves auto-enrollment or manual renewal, and the CRL for the old root must be published to ensure revocation is enforced.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Cryptography — study guide chapter
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FAQ
Questions learners often ask
What does this SSCP question test?
Cryptography — This question tests Cryptography — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Generate a new root CA, sign new subordinate CAs, distribute the new root via Group Policy, and re-issue all end-entity certificates. — Option A is correct because the root CA private key has been compromised, requiring the entire PKI hierarchy to be rebuilt from scratch. A new self-signed root CA must be generated, new subordinate CAs signed under it, and all end-entity certificates re-issued to devices. Distributing the new root CA certificate via Active Directory Group Policy ensures that all domain-joined systems trust the new hierarchy automatically, minimizing manual intervention and disruption.
What should I do if I get this SSCP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best", "immediately / without restart". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 25, 2026
This SSCP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SSCP exam.
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