- A
Transparent Data Encryption (TDE)
Why wrong: TDE encrypts the entire database at rest, but the database engine has access to the encryption keys, so DBAs can see plaintext.
- B
Always Encrypted with randomized encryption
Why wrong: Randomized encryption provides stronger security but does not support equality comparisons because the same plaintext encrypts to different ciphertexts each time.
- C
Always Encrypted with deterministic encryption
Deterministic encryption allows equality searches by generating consistent ciphertext for a given plaintext, and keys are stored client-side, preventing DBAs from decrypting.
- D
Dynamic Data Masking
Why wrong: Dynamic Data Masking obfuscates data for non-privileged users but does not encrypt it; privileged users can still see plaintext.
Quick Answer
The answer is Always Encrypted with deterministic encryption, because it is the only Azure SQL Database feature that both encrypts data at the client side—preventing even sysadmin-level database administrators from viewing plaintext—and supports equality comparisons on encrypted columns. Deterministic encryption works by generating identical ciphertext for any given plaintext value, which enables the database engine to perform WHERE clause equality checks directly on the encrypted data without ever decrypting it. On the AZ-500 exam, this scenario tests your understanding of column-level encryption trade-offs: deterministic encryption allows equality lookups but is vulnerable to pattern-matching attacks on low-cardinality data, while randomized encryption is more secure but blocks all comparisons. A common trap is confusing Always Encrypted with Transparent Data Encryption (TDE), which protects data at rest but does not restrict DBAs from viewing plaintext. Memory tip: think “Deterministic = Duplicates match,” so equality queries work.
AZ-500 Secure compute, storage, and databases Practice Question
This AZ-500 practice question tests your understanding of secure compute, storage, and databases. 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 healthcare organization stores sensitive patient data in Azure SQL Database. They need to encrypt specific columns containing medical history so that even database administrators with the 'sysadmin' role cannot view the plaintext data. Additionally, they need to support equality comparisons (WHERE clauses) on the encrypted columns. Which encryption technology should they implement?
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
Always Encrypted with deterministic encryption
Always Encrypted with deterministic encryption is correct because it encrypts specific columns at the client side, ensuring that even database administrators with 'sysadmin' role cannot view plaintext data. Deterministic encryption generates the same ciphertext for identical plaintext values, which allows equality comparisons (WHERE clauses) on encrypted columns, meeting both requirements.
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.
- ✗
Transparent Data Encryption (TDE)
Why it's wrong here
TDE encrypts the entire database at rest, but the database engine has access to the encryption keys, so DBAs can see plaintext.
- ✗
Always Encrypted with randomized encryption
Why it's wrong here
Randomized encryption provides stronger security but does not support equality comparisons because the same plaintext encrypts to different ciphertexts each time.
- ✓
Always Encrypted with deterministic encryption
Why this is correct
Deterministic encryption allows equality searches by generating consistent ciphertext for a given plaintext, and keys are stored client-side, preventing DBAs from decrypting.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Dynamic Data Masking
Why it's wrong here
Dynamic Data Masking obfuscates data for non-privileged users but does not encrypt it; privileged users can still see plaintext.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Dynamic Data Masking with encryption, thinking it prevents privileged users from seeing data, when in fact it only masks output and does not protect data at rest or from direct queries by sysadmins.
Detailed technical explanation
How to think about this question
Always Encrypted uses a two-tier key hierarchy: a column encryption key (CEK) is encrypted by a column master key (CMK), which is stored outside SQL Server (e.g., in Azure Key Vault or Windows Certificate Store). Deterministic encryption uses an initialization vector derived from the plaintext value, enabling equality lookups but making it vulnerable to frequency analysis if the column has low cardinality. In real-world scenarios, organizations often combine deterministic encryption for indexed columns used in JOINs or WHERE clauses with randomized encryption for highly sensitive columns that do not require search operations.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure compute, storage, and databases — This question tests Secure compute, storage, and databases — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Always Encrypted with deterministic encryption — Always Encrypted with deterministic encryption is correct because it encrypts specific columns at the client side, ensuring that even database administrators with 'sysadmin' role cannot view plaintext data. Deterministic encryption generates the same ciphertext for identical plaintext values, which allows equality comparisons (WHERE clauses) on encrypted columns, meeting both requirements.
What should I do if I get this AZ-500 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 11, 2026
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