VA-003 Explain encryption as a service Practice Question
This VA-003 practice question tests your understanding of explain encryption as a service. 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.
A developer wants to encrypt a password before storing it in a database. The encryption must be deterministic so that the same plaintext always produces the same ciphertext. Which encryption mode should be used in the transit secrets engine?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
convergent-encryption
The transit secrets engine in Vault supports convergent encryption, which is a deterministic encryption mode where the same plaintext and context always produce the same ciphertext. This is achieved by using the plaintext itself as part of the encryption key derivation, ensuring repeatable output. The question specifically requires deterministic encryption, making convergent encryption the correct choice.
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.
✗
chacha20-poly1305
Why it's wrong here
ChaCha20-Poly1305 also uses a random nonce, producing different ciphertexts.
✓
convergent-encryption
Why this is correct
Convergent encryption derives the nonce from the plaintext and context, making output deterministic.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
aes128-gcm96
Why it's wrong here
AES128-GCM96 is a variant of AES-GCM and still non-deterministic.
✗
aes-gcm
Why it's wrong here
AES-GCM uses a random nonce, making ciphertext non-deterministic.
✗
padding
Why it's wrong here
Padding is not an encryption mode; it's an option for some encryption operations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the misconception that any AES-GCM mode is deterministic, but in practice, AES-GCM requires a unique nonce for each encryption, making it non-deterministic unless combined with convergent encryption or a fixed nonce (which would break security guarantees).
Detailed technical explanation
How to think about this question
Convergent encryption works by deriving an encryption key from the plaintext's hash (e.g., SHA-256) and then encrypting the plaintext with that key, often using AES in a deterministic mode like AES-SIV. This ensures that identical plaintexts produce identical ciphertexts, which is useful for deduplication in storage systems but introduces a vulnerability: if an attacker knows the plaintext, they can recompute the ciphertext and verify guesses. In Vault, convergent encryption is enabled by setting the `convergent_encryption` parameter to `true` when creating or updating an encryption key.
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 practitioner preparing for the VA-003 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
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.
Explain encryption as a service — This question tests Explain encryption as a service — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: convergent-encryption — The transit secrets engine in Vault supports convergent encryption, which is a deterministic encryption mode where the same plaintext and context always produce the same ciphertext. This is achieved by using the plaintext itself as part of the encryption key derivation, ensuring repeatable output. The question specifically requires deterministic encryption, making convergent encryption the correct choice.
What should I do if I get this VA-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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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