The answer is that the KMS key policy does not grant encrypt permission to the user. This is the most likely cause because a customer-managed KMS key relies on its own resource-based policy to authorize actions like `kms:Encrypt`, and without an explicit grant for that action, AWS KMS denies the request regardless of any broader IAM permissions the user may hold. On the Certified Cloud Security Professional CCSP exam, this scenario tests your understanding of how key policies interact with IAM policies—specifically, that a key policy acts as the final gatekeeper for a customer-managed key, and an “encrypt permission denied” error almost always points to a missing or misconfigured statement in that policy. A common trap is assuming IAM permissions alone suffice, but for customer-managed keys, the key policy must explicitly allow the action. Memory tip: think of the key policy as the “bouncer” for the key—even if you have a VIP pass (IAM), the bouncer must see your name on the list (key policy) to let you encrypt.
CCSP Cloud Data Security Practice Question
This CCSP practice question tests your understanding of cloud data security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
Refer to the exhibit.
Error: Failed to create resource. Status: 403 Forbidden.
{
"Code": "AccessDenied",
"Message": "Access denied. Please ensure that the key policy grants the necessary permissions.",
"Resource": "arn:aws:kms:us-east-1:123456789012:key/abc123"
}
A developer receives the above error when trying to encrypt an object using a customer-managed KMS key. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The KMS key policy does not grant encrypt permission to the user
The error indicates the user lacks permission to encrypt with the specified KMS key. Since the key is customer-managed, its key policy must explicitly grant the `kms:Encrypt` action to the user or role. Without this permission, AWS KMS denies the request, even if the user has other IAM permissions.
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 KMS key policy does not grant encrypt permission to the user
Why this is correct
Key policy controls who can use the key.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The S3 bucket policy denies KMS actions
Why it's wrong here
S3 bucket policy does not affect KMS API calls directly.
✗
The user is not in the same region as the key
Why it's wrong here
Region mismatch would give different error.
✗
The KMS key is disabled
Why it's wrong here
Error message does not mention disabled key.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between key policies and IAM policies, trapping candidates who assume IAM permissions alone are sufficient for KMS operations.
Detailed technical explanation
How to think about this question
KMS key policies are resource-based policies that define who can use the key and what actions they can perform. When a user calls `kms:Encrypt`, the key policy is evaluated first; if it does not include the user's ARN with the `kms:Encrypt` action, the request is denied regardless of IAM permissions. This is a common misconfiguration when using cross-account keys or when the key policy is not updated after creating a new IAM user.
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.
Cloud Data Security — This question tests Cloud Data Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The KMS key policy does not grant encrypt permission to the user — The error indicates the user lacks permission to encrypt with the specified KMS key. Since the key is customer-managed, its key policy must explicitly grant the `kms:Encrypt` action to the user or role. Without this permission, AWS KMS denies the request, even if the user has other IAM permissions.
What should I do if I get this CCSP 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This CCSP 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 CCSP exam.
Question Discussion
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