Why it matters

Encryption at rest is baseline. Understanding shapes storage design.

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The architecture

Storage: encrypted volumes, S3 SSE-KMS, GCS CMEK.

Keys: KMS + rotation.

Encryption at restStorageencrypted volumesKeysKMS-managedRotationperiodicSSE-KMS for S3, CMEK for GCS/Azure; per-tenant keys for isolation
Encryption at rest.
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How it works end to end

SSE-KMS: AWS S3 encryption.

CMEK: customer-managed keys.

Per-tenant keys for isolation.

Key rotation policies.