Quick Answer
The answer is client-side encryption before uploading data. This approach ensures data confidentiality in a cloud breach because encryption occurs on the organization’s own systems, meaning the cloud provider never possesses the plaintext or the decryption keys. Even if an attacker compromises the provider’s infrastructure, the encrypted data remains unreadable without the keys held solely by the organization. On the CISA exam, this question tests your understanding of data ownership and cryptographic controls in shared responsibility models—a common trap is assuming server-side encryption or SSL/TLS in transit offers the same protection, but those still expose data to the provider. Remember the mnemonic: “Encrypt before you send, keys you defend.” This principle is critical because client-side encryption is the only method that guarantees confidentiality regardless of the provider’s security posture, making it the definitive answer for auditor-focused scenarios.
This CISA practice question tests your understanding of protection of information assets. 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.
An organization uses a third-party cloud service for data storage. Which of the following is the BEST way to ensure data confidentiality in the event of a cloud provider breach?
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.
Rely on the cloud provider's encryption at rest
Why wrong: Provider may have access to keys.
Use TLS for data in transit
Why wrong: TLS does not protect data at rest.
Implement client-side encryption before uploading data
Client-side encryption ensures only the organization controls keys.
Deploy a cloud access security broker (CASB) with DLP
Why wrong: CASB helps monitor but does not guarantee confidentiality in breach.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Implement client-side encryption before uploading data
Client-side encryption ensures that data is encrypted before it leaves the organization's control, so the cloud provider never has access to the plaintext or the encryption keys. In the event of a provider breach, the encrypted data remains confidential because only the organization holds the keys to decrypt it. This is the only option that guarantees confidentiality regardless of the cloud provider's security posture.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Rely on the cloud provider's encryption at rest
Why it's wrong here
Provider may have access to keys.
Use TLS for data in transit
Implement client-side encryption before uploading data
Why this is correct
Client-side encryption ensures only the organization controls keys.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Deploy a cloud access security broker (CASB) with DLP
Why it's wrong here
CASB helps monitor but does not guarantee confidentiality in breach.
Common exam traps
ISACA often tests the distinction between encryption at rest (provider-managed) and client-side encryption, where candidates mistakenly assume that any encryption at rest is sufficient to protect against a provider breach.
Detailed technical explanation
Client-side encryption typically uses a symmetric key (e.g., AES-256) to encrypt the data locally, and the key is never sent to the cloud provider. This approach is often combined with envelope encryption, where a data encryption key (DEK) is encrypted by a key encryption key (KEK) stored on-premises or in a separate key management system. In a real-world scenario, even if an attacker gains full access to the cloud storage bucket, they only retrieve ciphertext and cannot decrypt it without the client-held keys.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CISA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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
Protection of Information Assets — This question tests Protection of Information Assets — Read the scenario before looking for a memorised answer..
The correct answer is: Implement client-side encryption before uploading data — Client-side encryption ensures that data is encrypted before it leaves the organization's control, so the cloud provider never has access to the plaintext or the encryption keys. In the event of a provider breach, the encrypted data remains confidential because only the organization holds the keys to decrypt it. This is the only option that guarantees confidentiality regardless of the cloud provider's security posture.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "best". 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.
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. An organization is migrating sensitive customer data to a public cloud. Which of the following encryption strategies provides the STRONGEST protection against data exposure to the cloud provider?
mediumWhy B: Client-side encryption with keys managed on-premises ensures that the cloud provider never has access to the encryption keys or the plaintext data. Even if the cloud provider's infrastructure is compromised or they have administrative access, the data remains encrypted and unreadable. This provides the strongest protection because the cloud provider is excluded from the cryptographic trust boundary.
Variation 2. An organization stores sensitive research data in a cloud storage service. The data must be encrypted at rest and in transit, and the organization wants to maintain control over encryption keys. Which solution best meets these requirements?
hardWhy B: Client-side encryption with a customer-managed key vault ensures data is encrypted before it leaves the client environment, so the cloud provider never has access to plaintext or the encryption keys. This satisfies both at-rest and in-transit encryption requirements while giving the organization full control over key management, unlike server-side options where the provider manages at least part of the key lifecycle.
Last reviewed: Jun 30, 2026
This CISA practice question is part of Courseiva's free ISACA 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 CISA exam.
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