What are the main components of Vault's architecture?

beginner

Re-explain

Core Components:

Storage Backend: Persists encrypted data (Consul, file system, cloud storage)
Barrier: Encrypts/decrypts data before storage using a master key
Secret Engines: Handle different types of secrets (KV, databases, PKI)
Auth Methods: Handle client authentication (tokens, LDAP, AWS IAM)
Policies: Define permissions for authenticated clients
Audit Devices: Log all requests and responses for compliance

Data Flow:
Client → Auth Method → Policy Evaluation → Secret Engine → Storage Backend

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