The answer is data masking in test environments and encrypting stored data. Data masking ensures privacy by replacing sensitive information with realistic but fictitious values in non-production systems, preventing exposure during development and testing, while encryption protects data at rest by rendering it unreadable without the proper decryption key, a requirement under regulations like GDPR and PCI DSS. On the CISA exam, this topic tests your understanding of data privacy controls within the system development lifecycle, often appearing in scenario-based questions where you must distinguish between controls that prevent exposure versus those that protect after a breach. A common trap is confusing access controls with masking or encryption—remember that masking hides data from view, while encryption locks it away. Memory tip: “Mask for test, encrypt for rest.”
CISA Practice Question: Information Systems Acquisition, Development and Implementation
This CISA practice question tests your understanding of information systems acquisition, development and implementation. 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.
Which TWO of the following are key controls for ensuring data privacy during system development?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Encrypting stored data
Encrypting stored data (Option B) is a key control for ensuring data privacy because it renders the data unreadable without the correct decryption key, protecting it from unauthorized access even if the storage medium is compromised. This aligns with data-at-rest protection requirements under regulations like GDPR and PCI DSS, and is a fundamental security control during system development to prevent exposure of sensitive information.
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.
✗
Using real customer data for testing
Why it's wrong here
Using real customer data increases exposure and violates data privacy principles.
✓
Encrypting stored data
Why this is correct
Encryption provides a strong control to protect sensitive data at rest.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disabling audit logs during development
Why it's wrong here
Audit logs are essential for detecting and investigating privacy breaches.
✗
Allowing developers unlimited access to production data
Why it's wrong here
Unlimited access increases the risk of unauthorized exposure or misuse.
✓
Data masking in test environments
Why this is correct
Data masking replaces sensitive data with realistic but fictitious data, reducing privacy risk.
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 may confuse 'data masking' with 'anonymization' and overlook its role as a key privacy control, or mistakenly think that using real data in test environments is acceptable if it is 'just for testing,' ignoring regulatory and ethical requirements.
Detailed technical explanation
How to think about this question
Data masking (Option E) works by irreversibly transforming sensitive data (e.g., using substitution, shuffling, or encryption with a static key) into realistic but fictitious values, ensuring that test environments contain no actual PII. This is often implemented via tools that apply masking rules at the database level, such as replacing credit card numbers with format-preserving tokens, while maintaining referential integrity for functional testing. A real-world scenario is a healthcare application where patient names are replaced with pseudonyms in test databases, allowing developers to validate features without violating HIPAA.
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 network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
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.
Information Systems Acquisition, Development and Implementation — This question tests Information Systems Acquisition, Development and Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Encrypting stored data — Encrypting stored data (Option B) is a key control for ensuring data privacy because it renders the data unreadable without the correct decryption key, protecting it from unauthorized access even if the storage medium is compromised. This aligns with data-at-rest protection requirements under regulations like GDPR and PCI DSS, and is a fundamental security control during system development to prevent exposure of sensitive information.
What should I do if I get this CISA 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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