- A
To validate certificate chains
Why wrong: Certificate chain validation involves verifying signatures from the root CA to the end-entity certificate; CRL is used to check revocation status.
- B
To encrypt certificate requests
Why wrong: CRLs are not used for encryption.
- C
To store all issued certificates
Why wrong: CRLs store only revoked certificates, not all issued ones.
- D
To publish revoked certificates
CRLs list certificates that have been revoked and should no longer be trusted.
Question 246 of 1,000
SSCP Cryptography Practice Question
This SSCP practice question tests your understanding of cryptography. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is implementing a PKI for internal use. What is the primary purpose of a Certificate Revocation List (CRL)?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
✓
To publish revoked certificates
The primary purpose of a Certificate Revocation List (CRL) is to publish a list of certificates that have been revoked by the Certificate Authority (CA) before their scheduled expiration. This allows relying parties to verify that a certificate is still valid and has not been compromised, ensuring trust in the PKI.
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.
- ✗
To validate certificate chains
Why it's wrong here
Certificate chain validation involves verifying signatures from the root CA to the end-entity certificate; CRL is used to check revocation status.
- ✗
To encrypt certificate requests
Why it's wrong here
CRLs are not used for encryption.
- ✗
To store all issued certificates
Why it's wrong here
CRLs store only revoked certificates, not all issued ones.
- ✓
To publish revoked certificates
Why this is correct
CRLs list certificates that have been revoked and should no longer be trusted.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the CRL's purpose with certificate validation or storage, mistakenly thinking it validates chains or stores all certificates, when in fact it only publishes revoked certificates for status checking.
Detailed technical explanation
How to think about this question
CRLs are defined in RFC 5280 and are signed by the CA to prevent tampering; they include a sequence of revoked certificate serial numbers, revocation dates, and optional reason codes. In practice, CRLs can become large and cause performance issues, leading to alternatives like OCSP (Online Certificate Status Protocol) for real-time revocation checks. A subtle behavior is that CRLs have a validity period (nextUpdate field), and if a CRL expires, clients may treat all certificates as revoked or untrusted until a fresh CRL is obtained.
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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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: To publish revoked certificates — The primary purpose of a Certificate Revocation List (CRL) is to publish a list of certificates that have been revoked by the Certificate Authority (CA) before their scheduled expiration. This allows relying parties to verify that a certificate is still valid and has not been compromised, ensuring trust in the PKI.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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: Jul 4, 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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