Quick Answer
The correct endpoint is POST /v1/transit/datakey/plaintext/my-key. This endpoint returns both the plaintext data key for local encryption and its ciphertext version for secure storage alongside the encrypted data, making it ideal for client-side encryption workflows where you need the raw key material to encrypt data at rest in a cloud bucket. On the HashiCorp Vault Associate VA-003 exam, this question tests your understanding of the transit engine’s datakey endpoints, specifically the distinction between the “plaintext” and “wrapped” variants. A common trap is confusing this with the “wrapped” endpoint, which only returns the ciphertext key and requires a separate unwrap step. Remember: if you need the plaintext key to encrypt locally, the path must include “plaintext” — think “plaintext for plain encryption.”
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 organization wants to encrypt data at rest in a cloud storage bucket. They plan to use Vault's transit engine to generate a data key and then encrypt the data locally. Which transit endpoint should they use to get a data key?
POST /v1/transit/datakey/plaintext/my-key
Returns both plaintext and ciphertext data key.
POST /v1/transit/encrypt/my-key
Why wrong: Encrypts data, not generate a key.
POST /v1/transit/decrypt/my-key
Why wrong: Decrypts data.
POST /v1/transit/datakey/ciphertext/my-key
Why wrong: Returns only ciphertext key.
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/datakey/plaintext/my-key
The correct endpoint to retrieve a data key that can be used for local client-side encryption is POST /v1/transit/datakey/plaintext/my-key. This endpoint returns both the plaintext data key (for local encryption) and the ciphertext version of the key (for secure storage alongside the encrypted data). The 'plaintext' in the path indicates that the response includes the key in plaintext form, which is necessary for performing encryption locally.
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/datakey/plaintext/my-key
Why this is correct
Returns both plaintext and ciphertext data key.
Related concept
Read the scenario before looking for a memorised answer.
POST /v1/transit/encrypt/my-key
Why it's wrong here
Encrypts data, not generate a key.
POST /v1/transit/decrypt/my-key
Why it's wrong here
Decrypts data.
POST /v1/transit/datakey/ciphertext/my-key
Why it's wrong here
Returns only ciphertext key.
Common exam traps
HashiCorp often tests the distinction between 'datakey/plaintext' and 'datakey/ciphertext' endpoints, where candidates mistakenly choose the ciphertext-only endpoint thinking it provides the key for local encryption, but it actually omits the plaintext key required for that purpose.
Detailed technical explanation
The transit engine's datakey endpoints generate a random data key (typically 256-bit AES) and optionally wrap it using the named key (my-key) stored in Vault. The 'plaintext' variant returns both the raw key and the wrapped key, enabling the client to encrypt data locally and then store the wrapped key alongside the ciphertext for future decryption via Vault. This pattern is commonly used in envelope encryption, where the data key is used for local symmetric encryption and the key encryption key (KEK) in Vault protects the data key.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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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/datakey/plaintext/my-key — The correct endpoint to retrieve a data key that can be used for local client-side encryption is POST /v1/transit/datakey/plaintext/my-key. This endpoint returns both the plaintext data key (for local encryption) and the ciphertext version of the key (for secure storage alongside the encrypted data). The 'plaintext' in the path indicates that the response includes the key in plaintext form, which is necessary for performing encryption locally.
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
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