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.
An application uses transit encryption with convergent encryption enabled. Which THREE statements are true about convergent encryption? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It produces the same ciphertext for the same plaintext and context.
Convergent encryption derives the encryption key from the plaintext content itself, typically by hashing the plaintext. Because the same plaintext always produces the same key, and the encryption algorithm is deterministic (no random nonce), the resulting ciphertext is identical for identical plaintexts. This property directly enables deduplication of encrypted data, as identical ciphertexts can be identified and stored only once.
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.
✗
It requires a separate key for each context.
Why it's wrong here
The same key can be used; context varies per encryption.
✓
It produces the same ciphertext for the same plaintext and context.
Why this is correct
Deterministic output is a key feature of convergent encryption.
Related concept
Read the scenario before looking for a memorised answer.
✗
It is typically slower than non-convergent encryption.
Why it's wrong here
Performance is similar; the overhead of nonce derivation is minimal.
✓
It can be used for deduplication of encrypted data.
Why this is correct
Same plaintext yields same ciphertext, enabling deduplication.
Related concept
Read the scenario before looking for a memorised answer.
✓
It uses a nonce that is derived from the plaintext.
Why this is correct
The nonce is computed from the plaintext and context to ensure determinism.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the misconception that convergent encryption requires a separate key for each context (Option A), when in fact the key is derived from the plaintext and is the same for identical data regardless of context.
Trap categories for this question
Similar concept trap
Performance is similar; the overhead of nonce derivation is minimal.
Detailed technical explanation
How to think about this question
Convergent encryption works by computing a cryptographic hash (e.g., SHA-256) of the plaintext to generate the encryption key, then encrypting the plaintext with a deterministic symmetric cipher (e.g., AES in CTR mode with a fixed IV derived from the key). A subtle behavior is that if the hash function has a collision, two different plaintexts could produce the same key and ciphertext, leading to data corruption. In real-world scenarios like cloud storage (e.g., AWS S3 Server-Side Encryption with customer-provided keys), convergent encryption enables deduplication at scale, reducing storage costs for identical files uploaded by different users.
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: It produces the same ciphertext for the same plaintext and context. — Convergent encryption derives the encryption key from the plaintext content itself, typically by hashing the plaintext. Because the same plaintext always produces the same key, and the encryption algorithm is deterministic (no random nonce), the resulting ciphertext is identical for identical plaintexts. This property directly enables deduplication of encrypted data, as identical ciphertexts can be identified and stored only once.
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.
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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