The answer is Always Encrypted with deterministic encryption. This technology provides column-level protection by encrypting data on the client side before it reaches Azure SQL Database, ensuring that even database administrators with the db_owner role never see plaintext values like social security numbers. Deterministic encryption is specifically required here because it always generates the same ciphertext for a given plaintext, which allows the application to perform equality searches—such as WHERE SSN = '123-45-6789'—directly on the encrypted column without the server ever decrypting the data. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this scenario tests your understanding of client-side encryption versus server-side options like Transparent Data Encryption (TDE), which does not protect data from the database owner. A common trap is choosing TDE or dynamic data masking, but neither supports equality searches while hiding data from admins. Memory tip: think “Deterministic for Direct equality searches” to remember that deterministic encryption enables WHERE clause lookups on encrypted columns.
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 company uses Azure SQL Database to store personally identifiable information (PII). They need to encrypt specific columns containing social security numbers so that even database administrators with the 'db_owner' role cannot view the plaintext. The application must be able to perform equality searches on the encrypted columns. Which encryption technology should they implement?
Why wrong: TDE encrypts the entire database at rest, but the database engine can still access plaintext. DBAs can query encrypted data in plaintext.
B
Always Encrypted with deterministic encryption
Always Encrypted encrypts data in the client driver, so the database cannot see plaintext. Deterministic encryption enables equality matching without revealing data.
C
Dynamic Data Masking
Why wrong: Dynamic Data Masking hides data from non-privileged users, but users with the 'db_owner' role can still see the unmasked plaintext data.
D
Row-Level Security
Why wrong: Row-Level Security restricts row access based on user, but it does not encrypt data. DBAs with 'db_owner' can bypass such policies.
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 the correct choice because it encrypts specific columns at the client-side, ensuring that even database administrators with db_owner cannot view plaintext data. Deterministic encryption generates the same ciphertext for a given plaintext value, enabling equality searches (e.g., WHERE SSN = '123-45-6789') directly on the encrypted column without decrypting the data on the server.
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 can still access plaintext. DBAs can query encrypted data in plaintext.
✓
Always Encrypted with deterministic encryption
Why this is correct
Always Encrypted encrypts data in the client driver, so the database cannot see plaintext. Deterministic encryption enables equality matching without revealing data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Dynamic Data Masking
Why it's wrong here
Dynamic Data Masking hides data from non-privileged users, but users with the 'db_owner' role can still see the unmasked plaintext data.
✗
Row-Level Security
Why it's wrong here
Row-Level Security restricts row access based on user, but it does not encrypt data. DBAs with 'db_owner' can bypass such policies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse encryption at rest (TDE) with client-side column encryption, mistakenly believing TDE protects against privileged users, but TDE only protects against physical theft of the database files, not against authorized database access.
Detailed technical explanation
How to think about this question
Always Encrypted uses a two-tier key hierarchy: a Column Encryption Key (CEK) protected by a Column Master Key (CMK) stored externally (e.g., Azure Key Vault). Deterministic encryption uses an initialization vector derived from the plaintext value, ensuring consistent ciphertext for identical inputs, which allows equality comparisons but not range or pattern matching. A subtle behavior is that deterministic encryption can leak frequency information if the column has low cardinality, so it should only be used when equality searches are required and the data distribution is well-understood.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
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 the correct choice because it encrypts specific columns at the client-side, ensuring that even database administrators with db_owner cannot view plaintext data. Deterministic encryption generates the same ciphertext for a given plaintext value, enabling equality searches (e.g., WHERE SSN = '123-45-6789') directly on the encrypted column without decrypting the data on the server.
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.
About these practice questions
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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. A company has an Azure SQL Database that stores personally identifiable information (PII) in columns. They need to encrypt those columns so that only authorized applications can decrypt the data, and even database administrators cannot view the plaintext. Additionally, they need to support equality comparisons (WHERE clauses) on the encrypted columns. Which encryption technology should they use?
medium
✓ A.Always Encrypted with deterministic encryption
B.Always Encrypted with randomized encryption
C.Transparent Data Encryption (TDE)
D.Dynamic Data Masking
Why A: Always Encrypted with deterministic encryption is the correct choice because it encrypts PII columns at the client side, ensuring that even database administrators cannot view plaintext data. Deterministic encryption generates the same ciphertext for the same plaintext, which allows equality comparisons (WHERE clauses) on encrypted columns, meeting the requirement for query support.
Variation 2. Your company uses Azure SQL Database and wants to protect sensitive data stored in a column named 'CreditCardNumber'. You need to ensure that the data is encrypted at rest and that only authorized users can decrypt the data at the application layer. Additionally, you want to prevent unauthorized administrators from accessing the plaintext. Which solution should you implement?
hard
A.Enable Transparent Data Encryption (TDE) and store the encryption key in Azure Key Vault
B.Use Dynamic Data Masking to mask the credit card column for non-privileged users
C.Implement Azure SQL Database's Always Encrypted with enclaves
✓ D.Implement Always Encrypted and store the column encryption key in Azure Key Vault
Why D: Option D is correct because Always Encrypted ensures data is encrypted at rest and in transit, and only client applications with the column encryption key can decrypt it; server administrators cannot access plaintext. Option A is wrong because TDE protects at rest but server administrators can still access plaintext. Option B is wrong because Dynamic Data Masking masks data but does not encrypt it. Option C is wrong because Transparent Data Encryption alone does not prevent server administrators from reading data.
Last reviewed: Jun 11, 2026
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