The correct approach is to use CMEK with a Cloud KMS key and enable Cloud Audit Logs for that key. This works because CMEK ensures your data in Cloud Storage is encrypted at rest using a key you control and rotate, while Cloud Audit Logs capture every operation against that key—such as encrypt, decrypt, enable, or disable—providing full auditability of key access. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding that auditing the key itself is essential, not just the bucket; a common trap is enabling audit logs only on the bucket, which misses key-level events. Remember the memory tip: “Audit the key, not just the bucket” to ensure you capture both encryption control and access logging for compliance.
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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 stores sensitive customer data in Cloud Storage. They want to ensure that data is encrypted at rest using customer-managed encryption keys (CMEK) and that access to the key is audited. Which approach should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use CMEK with a Cloud KMS key and enable Cloud Audit Logs for the key.
Option D is correct because it combines customer-managed encryption keys (CMEK) via Cloud KMS with Cloud Audit Logs enabled on the key itself. This ensures the data is encrypted at rest using a key that the customer controls and rotates, and all operations against that key (e.g., encrypt, decrypt, enable, disable) are logged for auditing. Cloud Audit Logs on the bucket alone would not capture key access events, which is required for full auditability.
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.
✗
Use Google-managed encryption keys and enable Cloud Audit Logs for the bucket.
Why it's wrong here
Google-managed keys do not allow customer control over key rotation or access.
✗
Use CMEK with key material stored in a Cloud Storage bucket.
Why it's wrong here
Key material for CMEK must be stored in Cloud KMS, not in Cloud Storage.
✗
Use customer-supplied encryption keys (CSEK) and store the keys in Secret Manager.
Why it's wrong here
CSEK requires providing the key with each request, and keys stored in Secret Manager are not automatically used by Cloud Storage.
✓
Use CMEK with a Cloud KMS key and enable Cloud Audit Logs for the key.
Why this is correct
CMEK uses Cloud KMS, and audit logs track access to the key.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between CMEK and CSEK, and the trap here is that candidates confuse 'customer-managed' with 'customer-supplied' and overlook that CMEK requires Cloud KMS for key management and auditing, not just storing key material in Cloud Storage or Secret Manager.
Detailed technical explanation
How to think about this question
CMEK uses Cloud KMS to wrap the data encryption key (DEK) with a key encryption key (KEK) stored in Cloud KMS; the DEK is generated and used by Cloud Storage, but the KEK is never exposed to the customer. Enabling Cloud Audit Logs on the Cloud KMS key records every call to the Cloud KMS API (e.g., Encrypt, Decrypt, GetPublicKey) via Admin Activity and Data Access audit logs, which is critical for compliance frameworks like PCI DSS or SOC 2. A real-world scenario is a healthcare provider needing to prove that no unauthorized decryption of patient records occurred; bucket-level logs alone would not show who accessed the key.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Ensuring data protection — This question tests Ensuring data protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use CMEK with a Cloud KMS key and enable Cloud Audit Logs for the key. — Option D is correct because it combines customer-managed encryption keys (CMEK) via Cloud KMS with Cloud Audit Logs enabled on the key itself. This ensures the data is encrypted at rest using a key that the customer controls and rotates, and all operations against that key (e.g., encrypt, decrypt, enable, disable) are logged for auditing. Cloud Audit Logs on the bucket alone would not capture key access events, which is required for full auditability.
What should I do if I get this PCSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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