VA-003 Explain encryption as a service Practice Question
Which THREE are appropriate use cases for Vault's Transit secrets engine?
⚠ Common exam trap
HashiCorp often tests the distinction between Transit (encryption as a service) and other secrets engines like PKI (certificates) and KV (static secrets), so candidates mistakenly associate Transit with any cryptographic task, including certificate management or secret storage.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Providing cryptographic offloading for applications running in untrusted environments
Option A is correct because the Transit secrets engine performs encryption/decryption as a service, so applications in untrusted environments can offload cryptographic operations to Vault without ever handling or storing the encryption keys themselves. Option D is correct because Transit supports signing and verification operations, allowing Vault to hold the signing key while the application submits data to be signed or verified. Option E is correct because Transit's encrypt/decrypt endpoints let an application encrypt sensitive database fields while the key material remains inside Vault, so the application never sees the encryption key. Option B is not a Transit use case; generating and managing TLS certificates is handled by the PKI secrets engine. Option C is not a Transit use case; storing and retrieving static secrets such as API keys is the role of the KV (Key/Value) secrets engine.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Providing cryptographic offloading for applications running in untrusted environments
Why this is correct
Vault's Transit secrets engine performs encryption and decryption operations centrally, so plaintext keys never leave Vault. Applications in untrusted environments send data to Vault for cryptographic processing, satisfying the offloading requirement without exposing key material locally. This directly addresses the constraint of operating where local key storage cannot be trusted.
- ✗
Generating and managing TLS certificates for internal services
Why it's wrong here
Transit performs cryptographic operations on data passed to it; it does not issue or manage certificates, which is the PKI secrets engine's role. It is tempting because Transit does hold keys and perform encryption, so certificate lifecycle management appears superficially similar.
- ✗
Storing and retrieving static secrets like API keys
Why it's wrong here
Transit encrypts and decrypts supplied plaintext; it does not persist arbitrary data, so static API keys belong in the KV secrets engine. It is tempting because Transit keys are stored and managed by Vault, which looks like secret storage rather than cryptographic processing.
- ✓
Performing signing and verification operations (e.g., for digital signatures)
Why this is correct
Vault's Transit secrets engine handles cryptographic operations without exposing keys, and its signing and verification endpoints support digital signatures directly. This satisfies the scenario's requirement for cryptographic signing use cases, since Transit performs asymmetric sign/verify operations on data while keys remain securely within Vault's boundary.
- ✓
Encrypting sensitive fields in a database without exposing encryption keys to the application
Why this is correct
Vault's Transit secrets engine performs cryptographic operations as a service, so applications send plaintext to Vault and receive ciphertext back, never handling key material themselves. This directly satisfies the stem's requirement of encrypting database fields while keeping encryption keys entirely outside the application's trust boundary.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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