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 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?
POST /v1/transit/decrypt/payment-key
Why wrong: Path for decryption.
POST /v1/transit/rewrap/payment-key
Why wrong: Path for rewrapping.
POST /v1/transit/keys/payment-key
Why wrong: Path for key management.
POST /v1/transit/encrypt/payment-key
Correct path for encryption.
Answer choices
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/payment-key
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
POST /v1/transit/decrypt/payment-key
Why it's wrong here
Path for decryption.
POST /v1/transit/rewrap/payment-key
Why it's wrong here
Path for rewrapping.
POST /v1/transit/keys/payment-key
Why it's wrong here
Path for key management.
POST /v1/transit/encrypt/payment-key
Why this is correct
Correct path for encryption.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
HashiCorp often tests the distinction between key management endpoints (like `/keys/`) and cryptographic operation endpoints (like `/encrypt/`), trapping candidates who confuse managing the key with using the key to encrypt data.
Detailed technical explanation
Under the hood, the transit engine uses envelope encryption: the plaintext is encrypted with a unique data key (derived from the named key) using AES-256-GCM or ChaCha20-Poly1305, and the ciphertext is returned along with metadata. A subtle behavior is that the key must have `allow_plaintext_backup` and encryption must be enabled in the key policy; otherwise, the endpoint returns a 400 error. In a real-world scenario, this endpoint is used to encrypt sensitive fields like credit card numbers before storing them in a database, ensuring the encryption key is never exposed to the application.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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What to study next
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FAQ
Explain encryption as a service — This question tests Explain encryption as a service — Read the scenario before looking for a memorised answer..
The correct answer is: POST /v1/transit/encrypt/payment-key — 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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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