VA-003 Explain encryption as a service Practice Question
This VA-003 practice question tests your understanding of explain encryption as a service. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 is using Vault Transit to encrypt files before uploading them to an S3 bucket. They notice that for a given plaintext file, the ciphertext output is always identical, even when encrypting at different times. They are using the `encrypt` endpoint with the default AES-GCM algorithm. The team is concerned about security because the repeated ciphertext leaks information (e.g., file equality). What is the most likely cause of this behavior?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
They are using convergent encryption
The correct answer is C because convergent encryption is a deterministic scheme where the encryption key is derived from the hash of the plaintext. When using Vault Transit with the default AES-GCM algorithm, the ciphertext will be identical for the same plaintext if the same key and nonce are used. This behavior matches the scenario described, as convergent encryption is designed to produce identical ciphertexts for identical plaintexts, which leaks file equality 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.
✗
They are using the wrong key
Why it's wrong here
Using the wrong key would result in different (invalid) ciphertexts, not consistent ones.
✗
They are using a deterministic encryption scheme
Why it's wrong here
While this is true, convergent encryption is the specific feature in Vault that causes this; option B is more precise.
✓
They are using convergent encryption
Why this is correct
Convergent encryption derives the key from the plaintext, resulting in identical ciphertexts for identical plaintexts.
Clue confirmation
The clue words "most likely", "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
They are not providing an encryption context
Why it's wrong here
Missing context does not make encryption deterministic; Vault still generates a random nonce.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the distinction between deterministic encryption (which can be secure with proper nonce management) and convergent encryption (which is inherently deterministic for deduplication), and the trap here is that candidates confuse 'deterministic encryption' (a general property) with 'convergent encryption' (a specific implementation that uses plaintext-derived keys).
Detailed technical explanation
How to think about this question
Convergent encryption works by hashing the plaintext (e.g., SHA-256) to generate the encryption key, then encrypting with AES-GCM using a nonce derived from the key or plaintext. This ensures the same plaintext always produces the same ciphertext, enabling deduplication but sacrificing semantic security. In Vault Transit, the `encrypt` endpoint with AES-GCM normally generates a random nonce, but if convergent encryption is configured (e.g., via a custom plugin or key derivation), the nonce is deterministic, leading to repeated ciphertext.
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: They are using convergent encryption — The correct answer is C because convergent encryption is a deterministic scheme where the encryption key is derived from the hash of the plaintext. When using Vault Transit with the default AES-GCM algorithm, the ciphertext will be identical for the same plaintext if the same key and nonce are used. This behavior matches the scenario described, as convergent encryption is designed to produce identical ciphertexts for identical plaintexts, which leaks file equality information.
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: "most likely", "always". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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