The answer is POST /v1/transit/encrypt/my-key. This is the correct path because the Transit secrets engine functions as Vault’s encryption-as-a-service, and the /encrypt endpoint is specifically designed to accept plaintext data and apply encryption using a named key, such as ‘my-key’, which must already exist in the engine. On the HashiCorp Vault Associate VA-003 exam, this question tests your understanding of the Transit engine’s core API structure and its role in securing data at rest or in transit without exposing the key material. A common trap is confusing the /encrypt path with /encrypt/data or the /transit/keys endpoint, which is used for key management, not data encryption. To remember, think of the pattern: transit/encrypt/{key-name} — the verb is always the action (encrypt) and the key name is the last segment, just like a file path.
VA-003 Explain encryption as a service Practice Question
This VA-003 practice question tests your understanding of explain encryption as a service. 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.
A DevOps team needs to encrypt sensitive configuration data before storing it in a version control system. They want to use Vault's encryption as a service to encrypt the data using a named encryption key. Which Vault path should they use to perform the encryption?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
POST /v1/transit/encrypt/my-key
The correct path for encrypting data using Vault's encryption-as-a-service is POST /v1/transit/encrypt/my-key. The Transit secrets engine provides encryption as a service, and the /encrypt endpoint is specifically designed to encrypt plaintext data using a named encryption key. The key name 'my-key' in the path identifies which key in the Transit engine should be used for the encryption operation.
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.
✓
POST /v1/transit/encrypt/my-key
Why this is correct
The encryption endpoint is /encrypt under the transit engine path, providing encryption as a service.
Related concept
Read the scenario before looking for a memorised answer.
✗
POST /v1/transit/sign/my-key
Why it's wrong here
This path is used for signing data, not encryption.
✗
POST /v1/transit/hmac/my-key
Why it's wrong here
This path computes an HMAC, not encryption.
✗
POST /v1/transit/random
Why it's wrong here
This endpoint generates random bytes, not encrypts data.
✗
POST /v1/transit/decrypt/my-key
Why it's wrong here
This path is used for decryption, not encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the distinction between encryption (/encrypt), signing (/sign), and HMAC (/hmac) endpoints, and candidates frequently confuse the purpose of /encrypt with /sign or /hmac because all three involve cryptographic operations on data.
Detailed technical explanation
How to think about this question
Under the hood, Vault's Transit engine uses envelope encryption: the named key (e.g., 'my-key') is a data key stored in Vault, and each encryption operation generates a unique data encryption key (DEK) that encrypts the plaintext, while the DEK itself is wrapped by the named key. This allows the Transit engine to encrypt large amounts of data without exposing the named key. In real-world scenarios, teams often use this to encrypt CI/CD pipeline secrets or configuration files before committing them to Git, ensuring that even if the repository is compromised, the data remains protected.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: POST /v1/transit/encrypt/my-key — The correct path for encrypting data using Vault's encryption-as-a-service is POST /v1/transit/encrypt/my-key. The Transit secrets engine provides encryption as a service, and the /encrypt endpoint is specifically designed to encrypt plaintext data using a named encryption key. The key name 'my-key' in the path identifies which key in the Transit engine should be used for the encryption operation.
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.
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 developer wants to encrypt data using Vault's transit engine with a key named 'payment-key'. The key already exists and is set to allow encryption. Which API path should the developer use to encrypt the data?
easy
A.POST /v1/transit/decrypt/payment-key
B.POST /v1/transit/rewrap/payment-key
C.POST /v1/transit/keys/payment-key
✓ D.POST /v1/transit/encrypt/payment-key
Why D: Option D is correct because the Vault transit engine exposes the `/v1/transit/encrypt/<key_name>` endpoint for encrypting plaintext data using a named encryption key. Since the key 'payment-key' already exists and is allowed to encrypt, a POST request to this path will perform the encryption operation and return the ciphertext.
Last reviewed: Jun 30, 2026
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This VA-003 practice question is part of Courseiva's free HashiCorp certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the VA-003 exam.
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