- A
The data in Cloud Storage is automatically deleted along with the key.
Why wrong: Destroying a KMS key does not delete the Cloud Storage objects. The objects remain but are permanently unreadable (cryptographic erasure).
- B
The encrypted data becomes permanently inaccessible (cryptographic erasure) since the decryption key no longer exists.
Without the KMS key, the envelope encryption key protecting the data key cannot be unwrapped. The ciphertext in GCS is permanent but unreadable — effective data deletion without physical deletion.
- C
Cloud Storage automatically re-encrypts the data using Google-managed keys as a fallback.
Why wrong: There is no automatic re-encryption fallback. Cloud Storage cannot re-encrypt data whose key has been destroyed since it cannot read the encrypted data to re-encrypt it.
- D
The key enters a 'disabled' state where data can still be decrypted by Google support.
Why wrong: Key disablement (not destruction) temporarily prevents use but allows re-enablement. Key destruction is permanent — even Google cannot recover the key material.
Quick Answer
The answer is that the encrypted data becomes permanently inaccessible due to cryptographic erasure. This occurs because Cloud KMS irrecoverably deletes the key material upon destruction, and without that decryption key, the ciphertext stored in Cloud Storage cannot be decrypted—even though the raw encrypted bytes remain in the bucket. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of the separation between key management and data storage, often appearing as a trap where candidates assume Cloud Storage retains a backup key or offers a recovery path. Remember, Cloud Storage never stores a copy of the KMS key, and there is no fallback re-encryption mechanism. A useful memory tip: “No key, no peek”—once the key is destroyed, the data is gone for good, regardless of the bucket’s contents.
Google ACE Configuring access and security Practice Question
This ACE practice question tests your understanding of configuring access and security. 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 Cloud KMS key used to encrypt a Cloud Storage bucket's data is being destroyed. What happens to the data in the bucket when the KMS key is destroyed?
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
The encrypted data becomes permanently inaccessible (cryptographic erasure) since the decryption key no longer exists.
When a Cloud KMS key is destroyed, the encrypted data in Cloud Storage becomes permanently inaccessible because the cryptographic key material is irrecoverably deleted. This is known as cryptographic erasure: without the key, the ciphertext cannot be decrypted, even though the raw encrypted bytes still exist in the bucket. Cloud Storage does not store a copy of the KMS key, and there is no fallback mechanism to re-encrypt or recover the data.
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.
- ✗
The data in Cloud Storage is automatically deleted along with the key.
Why it's wrong here
Destroying a KMS key does not delete the Cloud Storage objects. The objects remain but are permanently unreadable (cryptographic erasure).
- ✓
The encrypted data becomes permanently inaccessible (cryptographic erasure) since the decryption key no longer exists.
Why this is correct
Without the KMS key, the envelope encryption key protecting the data key cannot be unwrapped. The ciphertext in GCS is permanent but unreadable — effective data deletion without physical deletion.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud Storage automatically re-encrypts the data using Google-managed keys as a fallback.
Why it's wrong here
There is no automatic re-encryption fallback. Cloud Storage cannot re-encrypt data whose key has been destroyed since it cannot read the encrypted data to re-encrypt it.
- ✗
The key enters a 'disabled' state where data can still be decrypted by Google support.
Why it's wrong here
Key disablement (not destruction) temporarily prevents use but allows re-enablement. Key destruction is permanent — even Google cannot recover the key material.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that destroying a KMS key triggers automatic data deletion or that Google provides a fallback re-encryption mechanism, when in fact the data remains but is cryptographically erased and unrecoverable.
Detailed technical explanation
How to think about this question
Under the hood, Cloud KMS uses envelope encryption: each Cloud Storage object is encrypted with a unique data encryption key (DEK), which is then wrapped by a key encryption key (KEK) stored in Cloud KMS. When the KEK is destroyed, the DEK cannot be unwrapped, making the ciphertext permanently undecryptable. This is analogous to a hardware security module (HSM) zeroization event; in practice, this means that even if you have IAM permissions to the bucket, the data is effectively lost forever.
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.
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FAQ
Questions learners often ask
What does this ACE question test?
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The encrypted data becomes permanently inaccessible (cryptographic erasure) since the decryption key no longer exists. — When a Cloud KMS key is destroyed, the encrypted data in Cloud Storage becomes permanently inaccessible because the cryptographic key material is irrecoverably deleted. This is known as cryptographic erasure: without the key, the ciphertext cannot be decrypted, even though the raw encrypted bytes still exist in the bucket. Cloud Storage does not store a copy of the KMS key, and there is no fallback mechanism to re-encrypt or recover the data.
What should I do if I get this ACE 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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Last reviewed: Jun 30, 2026
This ACE practice question is part of Courseiva's free Google Cloud 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 ACE exam.
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