The correct answer is CryptoDeterministicConfig with a key from Cloud KMS. This configuration is the right choice because it performs deterministic encryption, meaning the same plaintext email address always produces the same ciphertext, which is essential for pseudonymization that remains consistent across database queries while being fully reversible for authorized users holding the Cloud KMS key. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of how Cloud DLP’s transformation types map to specific use cases—a common trap is confusing CryptoDeterministicConfig with CryptoReplaceConfig, which uses non-deterministic encryption and cannot produce consistent pseudonyms for the same input. Remember that “deterministic” equals “same in, same out,” making it ideal for joinable or searchable pseudonymized data. A quick memory tip: think “D” for Deterministic and “D” for Database consistency—if you need the same pseudonym every time for the same value, choose CryptoDeterministicConfig.
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 Cloud DLP to scan a Cloud SQL database for PII. They want to automatically pseudonymize email addresses found in a specific column using a deterministic encryption that can be reversed for authorized users. The key must be stored in Cloud KMS. Which DLP transformation should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
CryptoDeterministicConfig with a key from Cloud KMS.
Option B is correct because CryptoDeterministicConfig performs deterministic encryption (same plaintext always produces the same ciphertext) using a key from Cloud KMS, which allows pseudonymization that can be reversed by authorized users. This matches the requirement for a reversible, deterministic transformation on email addresses in a Cloud SQL column.
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.
✗
CryptoHashConfig with a cryptographic key from Cloud KMS.
Why it's wrong here
Hashing is one-way and not reversible.
✓
CryptoDeterministicConfig with a key from Cloud KMS.
Why this is correct
This provides deterministic, reversible encryption suitable for pseudonymization.
Related concept
Read the scenario before looking for a memorised answer.
✗
CryptoReplaceFfxFpeConfig using a key from Cloud KMS.
Why it's wrong here
Format-preserving encryption is less suitable for variable-length fields like email addresses.
✗
ReplaceWithInfoTypeConfig with a cryptographic key.
Why it's wrong here
This transformation replaces with info type without using a key.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between deterministic encryption (reversible, same output for same input) and hashing (one-way), leading candidates to mistakenly choose CryptoHashConfig when they need reversibility.
Detailed technical explanation
How to think about this question
CryptoDeterministicConfig uses AES-SIV (RFC 5297) encryption, which is deterministic and non-malleable, ensuring the same email always encrypts to the same ciphertext while preventing attackers from modifying the ciphertext undetected. The key is wrapped and stored in Cloud KMS, and DLP retrieves it via a KMS key name during transformation, allowing authorized users to decrypt by calling the KMS decrypt API with the same key. This is ideal for scenarios like joining pseudonymized data across tables or systems where consistent mapping is needed.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Ensuring data protection — This question tests Ensuring data protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: CryptoDeterministicConfig with a key from Cloud KMS. — Option B is correct because CryptoDeterministicConfig performs deterministic encryption (same plaintext always produces the same ciphertext) using a key from Cloud KMS, which allows pseudonymization that can be reversed by authorized users. This matches the requirement for a reversible, deterministic transformation on email addresses in a Cloud SQL column.
What should I do if I get this PCSE 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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